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linux/drivers/video/uvesafb.c
Eric W. Biederman 38bf195398 connector/userns: replace netlink uses of cap_raised() with capable() 
In 2009 Philip Reiser notied that a few users of netlink connector
interface needed a capability check and added the idiom
cap_raised(nsp->eff_cap, CAP_SYS_ADMIN) to a few of them, on the premise
that netlink was asynchronous.

In 2011 Patrick McHardy noticed we were being silly because netlink is
synchronous and removed eff_cap from the netlink_skb_params and changed
the idiom to cap_raised(current_cap(), CAP_SYS_ADMIN).

Looking at those spots with a fresh eye we should be calling
capable(CAP_SYS_ADMIN).  The only reason I can see for not calling capable
is that it once appeared we were not in the same task as the caller which
would have made calling capable() impossible.

In the initial user_namespace the only difference between between
cap_raised(current_cap(), CAP_SYS_ADMIN) and capable(CAP_SYS_ADMIN) are a
few sanity checks and the fact that capable(CAP_SYS_ADMIN) sets
PF_SUPERPRIV if we use the capability.

Since we are going to be using root privilege setting PF_SUPERPRIV seems
the right thing to do.

The motivation for this that patch is that in a child user namespace
cap_raised(current_cap(),...) tests your capabilities with respect to that
child user namespace not capabilities in the initial user namespace and
thus will allow processes that should be unprivielged to use the kernel
services that are only protected with cap_raised(current_cap(),..).

To fix possible user_namespace issues and to just clean up the code
replace cap_raised(current_cap(), CAP_SYS_ADMIN) with
capable(CAP_SYS_ADMIN).

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Patrick McHardy <kaber@trash.net>
Cc: Philipp Reisner <philipp.reisner@linbit.com>
Acked-by: Serge E. Hallyn <serge.hallyn@canonical.com>
Acked-by: Andrew G. Morgan <morgan@kernel.org>
Cc: Vasiliy Kulikov <segoon@openwall.com>
Cc: David Howells <dhowells@redhat.com>
Reviewed-by: James Morris <james.l.morris@oracle.com>
Cc: David Miller <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-10 23:21:39 -04:00

2078 lines
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/*
* A framebuffer driver for VBE 2.0+ compliant video cards
*
* (c) 2007 Michal Januszewski <spock@gentoo.org>
* Loosely based upon the vesafb driver.
*
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/skbuff.h>
#include <linux/timer.h>
#include <linux/completion.h>
#include <linux/connector.h>
#include <linux/random.h>
#include <linux/platform_device.h>
#include <linux/limits.h>
#include <linux/fb.h>
#include <linux/io.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <video/edid.h>
#include <video/uvesafb.h>
#ifdef CONFIG_X86
#include <video/vga.h>
#endif
#ifdef CONFIG_MTRR
#include <asm/mtrr.h>
#endif
#include "edid.h"
static struct cb_id uvesafb_cn_id = {
.idx = CN_IDX_V86D,
.val = CN_VAL_V86D_UVESAFB
};
static char v86d_path[PATH_MAX] = "/sbin/v86d";
static char v86d_started; /* has v86d been started by uvesafb? */
static struct fb_fix_screeninfo uvesafb_fix __devinitdata = {
.id = "VESA VGA",
.type = FB_TYPE_PACKED_PIXELS,
.accel = FB_ACCEL_NONE,
.visual = FB_VISUAL_TRUECOLOR,
};
static int mtrr __devinitdata = 3; /* enable mtrr by default */
static bool blank = 1; /* enable blanking by default */
static int ypan = 1; /* 0: scroll, 1: ypan, 2: ywrap */
static bool pmi_setpal __devinitdata = true; /* use PMI for palette changes */
static bool nocrtc __devinitdata; /* ignore CRTC settings */
static bool noedid __devinitdata; /* don't try DDC transfers */
static int vram_remap __devinitdata; /* set amt. of memory to be used */
static int vram_total __devinitdata; /* set total amount of memory */
static u16 maxclk __devinitdata; /* maximum pixel clock */
static u16 maxvf __devinitdata; /* maximum vertical frequency */
static u16 maxhf __devinitdata; /* maximum horizontal frequency */
static u16 vbemode __devinitdata; /* force use of a specific VBE mode */
static char *mode_option __devinitdata;
static u8 dac_width = 6;
static struct uvesafb_ktask *uvfb_tasks[UVESAFB_TASKS_MAX];
static DEFINE_MUTEX(uvfb_lock);
/*
* A handler for replies from userspace.
*
* Make sure each message passes consistency checks and if it does,
* find the kernel part of the task struct, copy the registers and
* the buffer contents and then complete the task.
*/
static void uvesafb_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
{
struct uvesafb_task *utask;
struct uvesafb_ktask *task;
if (!capable(CAP_SYS_ADMIN))
return;
if (msg->seq >= UVESAFB_TASKS_MAX)
return;
mutex_lock(&uvfb_lock);
task = uvfb_tasks[msg->seq];
if (!task || msg->ack != task->ack) {
mutex_unlock(&uvfb_lock);
return;
}
utask = (struct uvesafb_task *)msg->data;
/* Sanity checks for the buffer length. */
if (task->t.buf_len < utask->buf_len ||
utask->buf_len > msg->len - sizeof(*utask)) {
mutex_unlock(&uvfb_lock);
return;
}
uvfb_tasks[msg->seq] = NULL;
mutex_unlock(&uvfb_lock);
memcpy(&task->t, utask, sizeof(*utask));
if (task->t.buf_len && task->buf)
memcpy(task->buf, utask + 1, task->t.buf_len);
complete(task->done);
return;
}
static int uvesafb_helper_start(void)
{
char *envp[] = {
"HOME=/",
"PATH=/sbin:/bin",
NULL,
};
char *argv[] = {
v86d_path,
NULL,
};
return call_usermodehelper(v86d_path, argv, envp, UMH_WAIT_PROC);
}
/*
* Execute a uvesafb task.
*
* Returns 0 if the task is executed successfully.
*
* A message sent to the userspace consists of the uvesafb_task
* struct and (optionally) a buffer. The uvesafb_task struct is
* a simplified version of uvesafb_ktask (its kernel counterpart)
* containing only the register values, flags and the length of
* the buffer.
*
* Each message is assigned a sequence number (increased linearly)
* and a random ack number. The sequence number is used as a key
* for the uvfb_tasks array which holds pointers to uvesafb_ktask
* structs for all requests.
*/
static int uvesafb_exec(struct uvesafb_ktask *task)
{
static int seq;
struct cn_msg *m;
int err;
int len = sizeof(task->t) + task->t.buf_len;
/*
* Check whether the message isn't longer than the maximum
* allowed by connector.
*/
if (sizeof(*m) + len > CONNECTOR_MAX_MSG_SIZE) {
printk(KERN_WARNING "uvesafb: message too long (%d), "
"can't execute task\n", (int)(sizeof(*m) + len));
return -E2BIG;
}
m = kzalloc(sizeof(*m) + len, GFP_KERNEL);
if (!m)
return -ENOMEM;
init_completion(task->done);
memcpy(&m->id, &uvesafb_cn_id, sizeof(m->id));
m->seq = seq;
m->len = len;
m->ack = random32();
/* uvesafb_task structure */
memcpy(m + 1, &task->t, sizeof(task->t));
/* Buffer */
memcpy((u8 *)(m + 1) + sizeof(task->t), task->buf, task->t.buf_len);
/*
* Save the message ack number so that we can find the kernel
* part of this task when a reply is received from userspace.
*/
task->ack = m->ack;
mutex_lock(&uvfb_lock);
/* If all slots are taken -- bail out. */
if (uvfb_tasks[seq]) {
mutex_unlock(&uvfb_lock);
err = -EBUSY;
goto out;
}
/* Save a pointer to the kernel part of the task struct. */
uvfb_tasks[seq] = task;
mutex_unlock(&uvfb_lock);
err = cn_netlink_send(m, 0, GFP_KERNEL);
if (err == -ESRCH) {
/*
* Try to start the userspace helper if sending
* the request failed the first time.
*/
err = uvesafb_helper_start();
if (err) {
printk(KERN_ERR "uvesafb: failed to execute %s\n",
v86d_path);
printk(KERN_ERR "uvesafb: make sure that the v86d "
"helper is installed and executable\n");
} else {
v86d_started = 1;
err = cn_netlink_send(m, 0, gfp_any());
if (err == -ENOBUFS)
err = 0;
}
} else if (err == -ENOBUFS)
err = 0;
if (!err && !(task->t.flags & TF_EXIT))
err = !wait_for_completion_timeout(task->done,
msecs_to_jiffies(UVESAFB_TIMEOUT));
mutex_lock(&uvfb_lock);
uvfb_tasks[seq] = NULL;
mutex_unlock(&uvfb_lock);
seq++;
if (seq >= UVESAFB_TASKS_MAX)
seq = 0;
out:
kfree(m);
return err;
}
/*
* Free a uvesafb_ktask struct.
*/
static void uvesafb_free(struct uvesafb_ktask *task)
{
if (task) {
if (task->done)
kfree(task->done);
kfree(task);
}
}
/*
* Prepare a uvesafb_ktask struct to be used again.
*/
static void uvesafb_reset(struct uvesafb_ktask *task)
{
struct completion *cpl = task->done;
memset(task, 0, sizeof(*task));
task->done = cpl;
}
/*
* Allocate and prepare a uvesafb_ktask struct.
*/
static struct uvesafb_ktask *uvesafb_prep(void)
{
struct uvesafb_ktask *task;
task = kzalloc(sizeof(*task), GFP_KERNEL);
if (task) {
task->done = kzalloc(sizeof(*task->done), GFP_KERNEL);
if (!task->done) {
kfree(task);
task = NULL;
}
}
return task;
}
static void uvesafb_setup_var(struct fb_var_screeninfo *var,
struct fb_info *info, struct vbe_mode_ib *mode)
{
struct uvesafb_par *par = info->par;
var->vmode = FB_VMODE_NONINTERLACED;
var->sync = FB_SYNC_VERT_HIGH_ACT;
var->xres = mode->x_res;
var->yres = mode->y_res;
var->xres_virtual = mode->x_res;
var->yres_virtual = (par->ypan) ?
info->fix.smem_len / mode->bytes_per_scan_line :
mode->y_res;
var->xoffset = 0;
var->yoffset = 0;
var->bits_per_pixel = mode->bits_per_pixel;
if (var->bits_per_pixel == 15)
var->bits_per_pixel = 16;
if (var->bits_per_pixel > 8) {
var->red.offset = mode->red_off;
var->red.length = mode->red_len;
var->green.offset = mode->green_off;
var->green.length = mode->green_len;
var->blue.offset = mode->blue_off;
var->blue.length = mode->blue_len;
var->transp.offset = mode->rsvd_off;
var->transp.length = mode->rsvd_len;
} else {
var->red.offset = 0;
var->green.offset = 0;
var->blue.offset = 0;
var->transp.offset = 0;
var->red.length = 8;
var->green.length = 8;
var->blue.length = 8;
var->transp.length = 0;
}
}
static int uvesafb_vbe_find_mode(struct uvesafb_par *par,
int xres, int yres, int depth, unsigned char flags)
{
int i, match = -1, h = 0, d = 0x7fffffff;
for (i = 0; i < par->vbe_modes_cnt; i++) {
h = abs(par->vbe_modes[i].x_res - xres) +
abs(par->vbe_modes[i].y_res - yres) +
abs(depth - par->vbe_modes[i].depth);
/*
* We have an exact match in terms of resolution
* and depth.
*/
if (h == 0)
return i;
if (h < d || (h == d && par->vbe_modes[i].depth > depth)) {
d = h;
match = i;
}
}
i = 1;
if (flags & UVESAFB_EXACT_DEPTH &&
par->vbe_modes[match].depth != depth)
i = 0;
if (flags & UVESAFB_EXACT_RES && d > 24)
i = 0;
if (i != 0)
return match;
else
return -1;
}
static u8 *uvesafb_vbe_state_save(struct uvesafb_par *par)
{
struct uvesafb_ktask *task;
u8 *state;
int err;
if (!par->vbe_state_size)
return NULL;
state = kmalloc(par->vbe_state_size, GFP_KERNEL);
if (!state)
return ERR_PTR(-ENOMEM);
task = uvesafb_prep();
if (!task) {
kfree(state);
return NULL;
}
task->t.regs.eax = 0x4f04;
task->t.regs.ecx = 0x000f;
task->t.regs.edx = 0x0001;
task->t.flags = TF_BUF_RET | TF_BUF_ESBX;
task->t.buf_len = par->vbe_state_size;
task->buf = state;
err = uvesafb_exec(task);
if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
printk(KERN_WARNING "uvesafb: VBE get state call "
"failed (eax=0x%x, err=%d)\n",
task->t.regs.eax, err);
kfree(state);
state = NULL;
}
uvesafb_free(task);
return state;
}
static void uvesafb_vbe_state_restore(struct uvesafb_par *par, u8 *state_buf)
{
struct uvesafb_ktask *task;
int err;
if (!state_buf)
return;
task = uvesafb_prep();
if (!task)
return;
task->t.regs.eax = 0x4f04;
task->t.regs.ecx = 0x000f;
task->t.regs.edx = 0x0002;
task->t.buf_len = par->vbe_state_size;
task->t.flags = TF_BUF_ESBX;
task->buf = state_buf;
err = uvesafb_exec(task);
if (err || (task->t.regs.eax & 0xffff) != 0x004f)
printk(KERN_WARNING "uvesafb: VBE state restore call "
"failed (eax=0x%x, err=%d)\n",
task->t.regs.eax, err);
uvesafb_free(task);
}
static int __devinit uvesafb_vbe_getinfo(struct uvesafb_ktask *task,
struct uvesafb_par *par)
{
int err;
task->t.regs.eax = 0x4f00;
task->t.flags = TF_VBEIB;
task->t.buf_len = sizeof(struct vbe_ib);
task->buf = &par->vbe_ib;
strncpy(par->vbe_ib.vbe_signature, "VBE2", 4);
err = uvesafb_exec(task);
if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
printk(KERN_ERR "uvesafb: Getting VBE info block failed "
"(eax=0x%x, err=%d)\n", (u32)task->t.regs.eax,
err);
return -EINVAL;
}
if (par->vbe_ib.vbe_version < 0x0200) {
printk(KERN_ERR "uvesafb: Sorry, pre-VBE 2.0 cards are "
"not supported.\n");
return -EINVAL;
}
if (!par->vbe_ib.mode_list_ptr) {
printk(KERN_ERR "uvesafb: Missing mode list!\n");
return -EINVAL;
}
printk(KERN_INFO "uvesafb: ");
/*
* Convert string pointers and the mode list pointer into
* usable addresses. Print informational messages about the
* video adapter and its vendor.
*/
if (par->vbe_ib.oem_vendor_name_ptr)
printk("%s, ",
((char *)task->buf) + par->vbe_ib.oem_vendor_name_ptr);
if (par->vbe_ib.oem_product_name_ptr)
printk("%s, ",
((char *)task->buf) + par->vbe_ib.oem_product_name_ptr);
if (par->vbe_ib.oem_product_rev_ptr)
printk("%s, ",
((char *)task->buf) + par->vbe_ib.oem_product_rev_ptr);
if (par->vbe_ib.oem_string_ptr)
printk("OEM: %s, ",
((char *)task->buf) + par->vbe_ib.oem_string_ptr);
printk("VBE v%d.%d\n", ((par->vbe_ib.vbe_version & 0xff00) >> 8),
par->vbe_ib.vbe_version & 0xff);
return 0;
}
static int __devinit uvesafb_vbe_getmodes(struct uvesafb_ktask *task,
struct uvesafb_par *par)
{
int off = 0, err;
u16 *mode;
par->vbe_modes_cnt = 0;
/* Count available modes. */
mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
while (*mode != 0xffff) {
par->vbe_modes_cnt++;
mode++;
}
par->vbe_modes = kzalloc(sizeof(struct vbe_mode_ib) *
par->vbe_modes_cnt, GFP_KERNEL);
if (!par->vbe_modes)
return -ENOMEM;
/* Get info about all available modes. */
mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
while (*mode != 0xffff) {
struct vbe_mode_ib *mib;
uvesafb_reset(task);
task->t.regs.eax = 0x4f01;
task->t.regs.ecx = (u32) *mode;
task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
task->t.buf_len = sizeof(struct vbe_mode_ib);
task->buf = par->vbe_modes + off;
err = uvesafb_exec(task);
if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
printk(KERN_WARNING "uvesafb: Getting mode info block "
"for mode 0x%x failed (eax=0x%x, err=%d)\n",
*mode, (u32)task->t.regs.eax, err);
mode++;
par->vbe_modes_cnt--;
continue;
}
mib = task->buf;
mib->mode_id = *mode;
/*
* We only want modes that are supported with the current
* hardware configuration, color, graphics and that have
* support for the LFB.
*/
if ((mib->mode_attr & VBE_MODE_MASK) == VBE_MODE_MASK &&
mib->bits_per_pixel >= 8)
off++;
else
par->vbe_modes_cnt--;
mode++;
mib->depth = mib->red_len + mib->green_len + mib->blue_len;
/*
* Handle 8bpp modes and modes with broken color component
* lengths.
*/
if (mib->depth == 0 || (mib->depth == 24 &&
mib->bits_per_pixel == 32))
mib->depth = mib->bits_per_pixel;
}
if (par->vbe_modes_cnt > 0)
return 0;
else
return -EINVAL;
}
/*
* The Protected Mode Interface is 32-bit x86 code, so we only run it on
* x86 and not x86_64.
*/
#ifdef CONFIG_X86_32
static int __devinit uvesafb_vbe_getpmi(struct uvesafb_ktask *task,
struct uvesafb_par *par)
{
int i, err;
uvesafb_reset(task);
task->t.regs.eax = 0x4f0a;
task->t.regs.ebx = 0x0;
err = uvesafb_exec(task);
if ((task->t.regs.eax & 0xffff) != 0x4f || task->t.regs.es < 0xc000) {
par->pmi_setpal = par->ypan = 0;
} else {
par->pmi_base = (u16 *)phys_to_virt(((u32)task->t.regs.es << 4)
+ task->t.regs.edi);
par->pmi_start = (u8 *)par->pmi_base + par->pmi_base[1];
par->pmi_pal = (u8 *)par->pmi_base + par->pmi_base[2];
printk(KERN_INFO "uvesafb: protected mode interface info at "
"%04x:%04x\n",
(u16)task->t.regs.es, (u16)task->t.regs.edi);
printk(KERN_INFO "uvesafb: pmi: set display start = %p, "
"set palette = %p\n", par->pmi_start,
par->pmi_pal);
if (par->pmi_base[3]) {
printk(KERN_INFO "uvesafb: pmi: ports = ");
for (i = par->pmi_base[3]/2;
par->pmi_base[i] != 0xffff; i++)
printk("%x ", par->pmi_base[i]);
printk("\n");
if (par->pmi_base[i] != 0xffff) {
printk(KERN_INFO "uvesafb: can't handle memory"
" requests, pmi disabled\n");
par->ypan = par->pmi_setpal = 0;
}
}
}
return 0;
}
#endif /* CONFIG_X86_32 */
/*
* Check whether a video mode is supported by the Video BIOS and is
* compatible with the monitor limits.
*/
static int __devinit uvesafb_is_valid_mode(struct fb_videomode *mode,
struct fb_info *info)
{
if (info->monspecs.gtf) {
fb_videomode_to_var(&info->var, mode);
if (fb_validate_mode(&info->var, info))
return 0;
}
if (uvesafb_vbe_find_mode(info->par, mode->xres, mode->yres, 8,
UVESAFB_EXACT_RES) == -1)
return 0;
return 1;
}
static int __devinit uvesafb_vbe_getedid(struct uvesafb_ktask *task,
struct fb_info *info)
{
struct uvesafb_par *par = info->par;
int err = 0;
if (noedid || par->vbe_ib.vbe_version < 0x0300)
return -EINVAL;
task->t.regs.eax = 0x4f15;
task->t.regs.ebx = 0;
task->t.regs.ecx = 0;
task->t.buf_len = 0;
task->t.flags = 0;
err = uvesafb_exec(task);
if ((task->t.regs.eax & 0xffff) != 0x004f || err)
return -EINVAL;
if ((task->t.regs.ebx & 0x3) == 3) {
printk(KERN_INFO "uvesafb: VBIOS/hardware supports both "
"DDC1 and DDC2 transfers\n");
} else if ((task->t.regs.ebx & 0x3) == 2) {
printk(KERN_INFO "uvesafb: VBIOS/hardware supports DDC2 "
"transfers\n");
} else if ((task->t.regs.ebx & 0x3) == 1) {
printk(KERN_INFO "uvesafb: VBIOS/hardware supports DDC1 "
"transfers\n");
} else {
printk(KERN_INFO "uvesafb: VBIOS/hardware doesn't support "
"DDC transfers\n");
return -EINVAL;
}
task->t.regs.eax = 0x4f15;
task->t.regs.ebx = 1;
task->t.regs.ecx = task->t.regs.edx = 0;
task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
task->t.buf_len = EDID_LENGTH;
task->buf = kzalloc(EDID_LENGTH, GFP_KERNEL);
err = uvesafb_exec(task);
if ((task->t.regs.eax & 0xffff) == 0x004f && !err) {
fb_edid_to_monspecs(task->buf, &info->monspecs);
if (info->monspecs.vfmax && info->monspecs.hfmax) {
/*
* If the maximum pixel clock wasn't specified in
* the EDID block, set it to 300 MHz.
*/
if (info->monspecs.dclkmax == 0)
info->monspecs.dclkmax = 300 * 1000000;
info->monspecs.gtf = 1;
}
} else {
err = -EINVAL;
}
kfree(task->buf);
return err;
}
static void __devinit uvesafb_vbe_getmonspecs(struct uvesafb_ktask *task,
struct fb_info *info)
{
struct uvesafb_par *par = info->par;
int i;
memset(&info->monspecs, 0, sizeof(info->monspecs));
/*
* If we don't get all necessary data from the EDID block,
* mark it as incompatible with the GTF and set nocrtc so
* that we always use the default BIOS refresh rate.
*/
if (uvesafb_vbe_getedid(task, info)) {
info->monspecs.gtf = 0;
par->nocrtc = 1;
}
/* Kernel command line overrides. */
if (maxclk)
info->monspecs.dclkmax = maxclk * 1000000;
if (maxvf)
info->monspecs.vfmax = maxvf;
if (maxhf)
info->monspecs.hfmax = maxhf * 1000;
/*
* In case DDC transfers are not supported, the user can provide
* monitor limits manually. Lower limits are set to "safe" values.
*/
if (info->monspecs.gtf == 0 && maxclk && maxvf && maxhf) {
info->monspecs.dclkmin = 0;
info->monspecs.vfmin = 60;
info->monspecs.hfmin = 29000;
info->monspecs.gtf = 1;
par->nocrtc = 0;
}
if (info->monspecs.gtf)
printk(KERN_INFO
"uvesafb: monitor limits: vf = %d Hz, hf = %d kHz, "
"clk = %d MHz\n", info->monspecs.vfmax,
(int)(info->monspecs.hfmax / 1000),
(int)(info->monspecs.dclkmax / 1000000));
else
printk(KERN_INFO "uvesafb: no monitor limits have been set, "
"default refresh rate will be used\n");
/* Add VBE modes to the modelist. */
for (i = 0; i < par->vbe_modes_cnt; i++) {
struct fb_var_screeninfo var;
struct vbe_mode_ib *mode;
struct fb_videomode vmode;
mode = &par->vbe_modes[i];
memset(&var, 0, sizeof(var));
var.xres = mode->x_res;
var.yres = mode->y_res;
fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, &var, info);
fb_var_to_videomode(&vmode, &var);
fb_add_videomode(&vmode, &info->modelist);
}
/* Add valid VESA modes to our modelist. */
for (i = 0; i < VESA_MODEDB_SIZE; i++) {
if (uvesafb_is_valid_mode((struct fb_videomode *)
&vesa_modes[i], info))
fb_add_videomode(&vesa_modes[i], &info->modelist);
}
for (i = 0; i < info->monspecs.modedb_len; i++) {
if (uvesafb_is_valid_mode(&info->monspecs.modedb[i], info))
fb_add_videomode(&info->monspecs.modedb[i],
&info->modelist);
}
return;
}
static void __devinit uvesafb_vbe_getstatesize(struct uvesafb_ktask *task,
struct uvesafb_par *par)
{
int err;
uvesafb_reset(task);
/*
* Get the VBE state buffer size. We want all available
* hardware state data (CL = 0x0f).
*/
task->t.regs.eax = 0x4f04;
task->t.regs.ecx = 0x000f;
task->t.regs.edx = 0x0000;
task->t.flags = 0;
err = uvesafb_exec(task);
if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
printk(KERN_WARNING "uvesafb: VBE state buffer size "
"cannot be determined (eax=0x%x, err=%d)\n",
task->t.regs.eax, err);
par->vbe_state_size = 0;
return;
}
par->vbe_state_size = 64 * (task->t.regs.ebx & 0xffff);
}
static int __devinit uvesafb_vbe_init(struct fb_info *info)
{
struct uvesafb_ktask *task = NULL;
struct uvesafb_par *par = info->par;
int err;
task = uvesafb_prep();
if (!task)
return -ENOMEM;
err = uvesafb_vbe_getinfo(task, par);
if (err)
goto out;
err = uvesafb_vbe_getmodes(task, par);
if (err)
goto out;
par->nocrtc = nocrtc;
#ifdef CONFIG_X86_32
par->pmi_setpal = pmi_setpal;
par->ypan = ypan;
if (par->pmi_setpal || par->ypan) {
if (__supported_pte_mask & _PAGE_NX) {
par->pmi_setpal = par->ypan = 0;
printk(KERN_WARNING "uvesafb: NX protection is actively."
"We have better not to use the PMI.\n");
} else {
uvesafb_vbe_getpmi(task, par);
}
}
#else
/* The protected mode interface is not available on non-x86. */
par->pmi_setpal = par->ypan = 0;
#endif
INIT_LIST_HEAD(&info->modelist);
uvesafb_vbe_getmonspecs(task, info);
uvesafb_vbe_getstatesize(task, par);
out: uvesafb_free(task);
return err;
}
static int __devinit uvesafb_vbe_init_mode(struct fb_info *info)
{
struct list_head *pos;
struct fb_modelist *modelist;
struct fb_videomode *mode;
struct uvesafb_par *par = info->par;
int i, modeid;
/* Has the user requested a specific VESA mode? */
if (vbemode) {
for (i = 0; i < par->vbe_modes_cnt; i++) {
if (par->vbe_modes[i].mode_id == vbemode) {
modeid = i;
uvesafb_setup_var(&info->var, info,
&par->vbe_modes[modeid]);
fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
&info->var, info);
/*
* With pixclock set to 0, the default BIOS
* timings will be used in set_par().
*/
info->var.pixclock = 0;
goto gotmode;
}
}
printk(KERN_INFO "uvesafb: requested VBE mode 0x%x is "
"unavailable\n", vbemode);
vbemode = 0;
}
/* Count the modes in the modelist */
i = 0;
list_for_each(pos, &info->modelist)
i++;
/*
* Convert the modelist into a modedb so that we can use it with
* fb_find_mode().
*/
mode = kzalloc(i * sizeof(*mode), GFP_KERNEL);
if (mode) {
i = 0;
list_for_each(pos, &info->modelist) {
modelist = list_entry(pos, struct fb_modelist, list);
mode[i] = modelist->mode;
i++;
}
if (!mode_option)
mode_option = UVESAFB_DEFAULT_MODE;
i = fb_find_mode(&info->var, info, mode_option, mode, i,
NULL, 8);
kfree(mode);
}
/* fb_find_mode() failed */
if (i == 0) {
info->var.xres = 640;
info->var.yres = 480;
mode = (struct fb_videomode *)
fb_find_best_mode(&info->var, &info->modelist);
if (mode) {
fb_videomode_to_var(&info->var, mode);
} else {
modeid = par->vbe_modes[0].mode_id;
uvesafb_setup_var(&info->var, info,
&par->vbe_modes[modeid]);
fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
&info->var, info);
goto gotmode;
}
}
/* Look for a matching VBE mode. */
modeid = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres,
info->var.bits_per_pixel, UVESAFB_EXACT_RES);
if (modeid == -1)
return -EINVAL;
uvesafb_setup_var(&info->var, info, &par->vbe_modes[modeid]);
gotmode:
/*
* If we are not VBE3.0+ compliant, we're done -- the BIOS will
* ignore our timings anyway.
*/
if (par->vbe_ib.vbe_version < 0x0300 || par->nocrtc)
fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
&info->var, info);
return modeid;
}
static int uvesafb_setpalette(struct uvesafb_pal_entry *entries, int count,
int start, struct fb_info *info)
{
struct uvesafb_ktask *task;
#ifdef CONFIG_X86
struct uvesafb_par *par = info->par;
int i = par->mode_idx;
#endif
int err = 0;
/*
* We support palette modifications for 8 bpp modes only, so
* there can never be more than 256 entries.
*/
if (start + count > 256)
return -EINVAL;
#ifdef CONFIG_X86
/* Use VGA registers if mode is VGA-compatible. */
if (i >= 0 && i < par->vbe_modes_cnt &&
par->vbe_modes[i].mode_attr & VBE_MODE_VGACOMPAT) {
for (i = 0; i < count; i++) {
outb_p(start + i, dac_reg);
outb_p(entries[i].red, dac_val);
outb_p(entries[i].green, dac_val);
outb_p(entries[i].blue, dac_val);
}
}
#ifdef CONFIG_X86_32
else if (par->pmi_setpal) {
__asm__ __volatile__(
"call *(%%esi)"
: /* no return value */
: "a" (0x4f09), /* EAX */
"b" (0), /* EBX */
"c" (count), /* ECX */
"d" (start), /* EDX */
"D" (entries), /* EDI */
"S" (&par->pmi_pal)); /* ESI */
}
#endif /* CONFIG_X86_32 */
else
#endif /* CONFIG_X86 */
{
task = uvesafb_prep();
if (!task)
return -ENOMEM;
task->t.regs.eax = 0x4f09;
task->t.regs.ebx = 0x0;
task->t.regs.ecx = count;
task->t.regs.edx = start;
task->t.flags = TF_BUF_ESDI;
task->t.buf_len = sizeof(struct uvesafb_pal_entry) * count;
task->buf = entries;
err = uvesafb_exec(task);
if ((task->t.regs.eax & 0xffff) != 0x004f)
err = 1;
uvesafb_free(task);
}
return err;
}
static int uvesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
unsigned blue, unsigned transp,
struct fb_info *info)
{
struct uvesafb_pal_entry entry;
int shift = 16 - dac_width;
int err = 0;
if (regno >= info->cmap.len)
return -EINVAL;
if (info->var.bits_per_pixel == 8) {
entry.red = red >> shift;
entry.green = green >> shift;
entry.blue = blue >> shift;
entry.pad = 0;
err = uvesafb_setpalette(&entry, 1, regno, info);
} else if (regno < 16) {
switch (info->var.bits_per_pixel) {
case 16:
if (info->var.red.offset == 10) {
/* 1:5:5:5 */
((u32 *) (info->pseudo_palette))[regno] =
((red & 0xf800) >> 1) |
((green & 0xf800) >> 6) |
((blue & 0xf800) >> 11);
} else {
/* 0:5:6:5 */
((u32 *) (info->pseudo_palette))[regno] =
((red & 0xf800) ) |
((green & 0xfc00) >> 5) |
((blue & 0xf800) >> 11);
}
break;
case 24:
case 32:
red >>= 8;
green >>= 8;
blue >>= 8;
((u32 *)(info->pseudo_palette))[regno] =
(red << info->var.red.offset) |
(green << info->var.green.offset) |
(blue << info->var.blue.offset);
break;
}
}
return err;
}
static int uvesafb_setcmap(struct fb_cmap *cmap, struct fb_info *info)
{
struct uvesafb_pal_entry *entries;
int shift = 16 - dac_width;
int i, err = 0;
if (info->var.bits_per_pixel == 8) {
if (cmap->start + cmap->len > info->cmap.start +
info->cmap.len || cmap->start < info->cmap.start)
return -EINVAL;
entries = kmalloc(sizeof(*entries) * cmap->len, GFP_KERNEL);
if (!entries)
return -ENOMEM;
for (i = 0; i < cmap->len; i++) {
entries[i].red = cmap->red[i] >> shift;
entries[i].green = cmap->green[i] >> shift;
entries[i].blue = cmap->blue[i] >> shift;
entries[i].pad = 0;
}
err = uvesafb_setpalette(entries, cmap->len, cmap->start, info);
kfree(entries);
} else {
/*
* For modes with bpp > 8, we only set the pseudo palette in
* the fb_info struct. We rely on uvesafb_setcolreg to do all
* sanity checking.
*/
for (i = 0; i < cmap->len; i++) {
err |= uvesafb_setcolreg(cmap->start + i, cmap->red[i],
cmap->green[i], cmap->blue[i],
0, info);
}
}
return err;
}
static int uvesafb_pan_display(struct fb_var_screeninfo *var,
struct fb_info *info)
{
#ifdef CONFIG_X86_32
int offset;
struct uvesafb_par *par = info->par;
offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
/*
* It turns out it's not the best idea to do panning via vm86,
* so we only allow it if we have a PMI.
*/
if (par->pmi_start) {
__asm__ __volatile__(
"call *(%%edi)"
: /* no return value */
: "a" (0x4f07), /* EAX */
"b" (0), /* EBX */
"c" (offset), /* ECX */
"d" (offset >> 16), /* EDX */
"D" (&par->pmi_start)); /* EDI */
}
#endif
return 0;
}
static int uvesafb_blank(int blank, struct fb_info *info)
{
struct uvesafb_ktask *task;
int err = 1;
#ifdef CONFIG_X86
struct uvesafb_par *par = info->par;
if (par->vbe_ib.capabilities & VBE_CAP_VGACOMPAT) {
int loop = 10000;
u8 seq = 0, crtc17 = 0;
if (blank == FB_BLANK_POWERDOWN) {
seq = 0x20;
crtc17 = 0x00;
err = 0;
} else {
seq = 0x00;
crtc17 = 0x80;
err = (blank == FB_BLANK_UNBLANK) ? 0 : -EINVAL;
}
vga_wseq(NULL, 0x00, 0x01);
seq |= vga_rseq(NULL, 0x01) & ~0x20;
vga_wseq(NULL, 0x00, seq);
crtc17 |= vga_rcrt(NULL, 0x17) & ~0x80;
while (loop--);
vga_wcrt(NULL, 0x17, crtc17);
vga_wseq(NULL, 0x00, 0x03);
} else
#endif /* CONFIG_X86 */
{
task = uvesafb_prep();
if (!task)
return -ENOMEM;
task->t.regs.eax = 0x4f10;
switch (blank) {
case FB_BLANK_UNBLANK:
task->t.regs.ebx = 0x0001;
break;
case FB_BLANK_NORMAL:
task->t.regs.ebx = 0x0101; /* standby */
break;
case FB_BLANK_POWERDOWN:
task->t.regs.ebx = 0x0401; /* powerdown */
break;
default:
goto out;
}
err = uvesafb_exec(task);
if (err || (task->t.regs.eax & 0xffff) != 0x004f)
err = 1;
out: uvesafb_free(task);
}
return err;
}
static int uvesafb_open(struct fb_info *info, int user)
{
struct uvesafb_par *par = info->par;
int cnt = atomic_read(&par->ref_count);
u8 *buf = NULL;
if (!cnt && par->vbe_state_size) {
buf = uvesafb_vbe_state_save(par);
if (IS_ERR(buf)) {
printk(KERN_WARNING "uvesafb: save hardware state"
"failed, error code is %ld!\n", PTR_ERR(buf));
} else {
par->vbe_state_orig = buf;
}
}
atomic_inc(&par->ref_count);
return 0;
}
static int uvesafb_release(struct fb_info *info, int user)
{
struct uvesafb_ktask *task = NULL;
struct uvesafb_par *par = info->par;
int cnt = atomic_read(&par->ref_count);
if (!cnt)
return -EINVAL;
if (cnt != 1)
goto out;
task = uvesafb_prep();
if (!task)
goto out;
/* First, try to set the standard 80x25 text mode. */
task->t.regs.eax = 0x0003;
uvesafb_exec(task);
/*
* Now try to restore whatever hardware state we might have
* saved when the fb device was first opened.
*/
uvesafb_vbe_state_restore(par, par->vbe_state_orig);
out:
atomic_dec(&par->ref_count);
if (task)
uvesafb_free(task);
return 0;
}
static int uvesafb_set_par(struct fb_info *info)
{
struct uvesafb_par *par = info->par;
struct uvesafb_ktask *task = NULL;
struct vbe_crtc_ib *crtc = NULL;
struct vbe_mode_ib *mode = NULL;
int i, err = 0, depth = info->var.bits_per_pixel;
if (depth > 8 && depth != 32)
depth = info->var.red.length + info->var.green.length +
info->var.blue.length;
i = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres, depth,
UVESAFB_EXACT_RES | UVESAFB_EXACT_DEPTH);
if (i >= 0)
mode = &par->vbe_modes[i];
else
return -EINVAL;
task = uvesafb_prep();
if (!task)
return -ENOMEM;
setmode:
task->t.regs.eax = 0x4f02;
task->t.regs.ebx = mode->mode_id | 0x4000; /* use LFB */
if (par->vbe_ib.vbe_version >= 0x0300 && !par->nocrtc &&
info->var.pixclock != 0) {
task->t.regs.ebx |= 0x0800; /* use CRTC data */
task->t.flags = TF_BUF_ESDI;
crtc = kzalloc(sizeof(struct vbe_crtc_ib), GFP_KERNEL);
if (!crtc) {
err = -ENOMEM;
goto out;
}
crtc->horiz_start = info->var.xres + info->var.right_margin;
crtc->horiz_end = crtc->horiz_start + info->var.hsync_len;
crtc->horiz_total = crtc->horiz_end + info->var.left_margin;
crtc->vert_start = info->var.yres + info->var.lower_margin;
crtc->vert_end = crtc->vert_start + info->var.vsync_len;
crtc->vert_total = crtc->vert_end + info->var.upper_margin;
crtc->pixel_clock = PICOS2KHZ(info->var.pixclock) * 1000;
crtc->refresh_rate = (u16)(100 * (crtc->pixel_clock /
(crtc->vert_total * crtc->horiz_total)));
if (info->var.vmode & FB_VMODE_DOUBLE)
crtc->flags |= 0x1;
if (info->var.vmode & FB_VMODE_INTERLACED)
crtc->flags |= 0x2;
if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
crtc->flags |= 0x4;
if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
crtc->flags |= 0x8;
memcpy(&par->crtc, crtc, sizeof(*crtc));
} else {
memset(&par->crtc, 0, sizeof(*crtc));
}
task->t.buf_len = sizeof(struct vbe_crtc_ib);
task->buf = &par->crtc;
err = uvesafb_exec(task);
if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
/*
* The mode switch might have failed because we tried to
* use our own timings. Try again with the default timings.
*/
if (crtc != NULL) {
printk(KERN_WARNING "uvesafb: mode switch failed "
"(eax=0x%x, err=%d). Trying again with "
"default timings.\n", task->t.regs.eax, err);
uvesafb_reset(task);
kfree(crtc);
crtc = NULL;
info->var.pixclock = 0;
goto setmode;
} else {
printk(KERN_ERR "uvesafb: mode switch failed (eax="
"0x%x, err=%d)\n", task->t.regs.eax, err);
err = -EINVAL;
goto out;
}
}
par->mode_idx = i;
/* For 8bpp modes, always try to set the DAC to 8 bits. */
if (par->vbe_ib.capabilities & VBE_CAP_CAN_SWITCH_DAC &&
mode->bits_per_pixel <= 8) {
uvesafb_reset(task);
task->t.regs.eax = 0x4f08;
task->t.regs.ebx = 0x0800;
err = uvesafb_exec(task);
if (err || (task->t.regs.eax & 0xffff) != 0x004f ||
((task->t.regs.ebx & 0xff00) >> 8) != 8) {
dac_width = 6;
} else {
dac_width = 8;
}
}
info->fix.visual = (info->var.bits_per_pixel == 8) ?
FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
info->fix.line_length = mode->bytes_per_scan_line;
out: if (crtc != NULL)
kfree(crtc);
uvesafb_free(task);
return err;
}
static void uvesafb_check_limits(struct fb_var_screeninfo *var,
struct fb_info *info)
{
const struct fb_videomode *mode;
struct uvesafb_par *par = info->par;
/*
* If pixclock is set to 0, then we're using default BIOS timings
* and thus don't have to perform any checks here.
*/
if (!var->pixclock)
return;
if (par->vbe_ib.vbe_version < 0x0300) {
fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, var, info);
return;
}
if (!fb_validate_mode(var, info))
return;
mode = fb_find_best_mode(var, &info->modelist);
if (mode) {
if (mode->xres == var->xres && mode->yres == var->yres &&
!(mode->vmode & (FB_VMODE_INTERLACED | FB_VMODE_DOUBLE))) {
fb_videomode_to_var(var, mode);
return;
}
}
if (info->monspecs.gtf && !fb_get_mode(FB_MAXTIMINGS, 0, var, info))
return;
/* Use default refresh rate */
var->pixclock = 0;
}
static int uvesafb_check_var(struct fb_var_screeninfo *var,
struct fb_info *info)
{
struct uvesafb_par *par = info->par;
struct vbe_mode_ib *mode = NULL;
int match = -1;
int depth = var->red.length + var->green.length + var->blue.length;
/*
* Various apps will use bits_per_pixel to set the color depth,
* which is theoretically incorrect, but which we'll try to handle
* here.
*/
if (depth == 0 || abs(depth - var->bits_per_pixel) >= 8)
depth = var->bits_per_pixel;
match = uvesafb_vbe_find_mode(par, var->xres, var->yres, depth,
UVESAFB_EXACT_RES);
if (match == -1)
return -EINVAL;
mode = &par->vbe_modes[match];
uvesafb_setup_var(var, info, mode);
/*
* Check whether we have remapped enough memory for this mode.
* We might be called at an early stage, when we haven't remapped
* any memory yet, in which case we simply skip the check.
*/
if (var->yres * mode->bytes_per_scan_line > info->fix.smem_len
&& info->fix.smem_len)
return -EINVAL;
if ((var->vmode & FB_VMODE_DOUBLE) &&
!(par->vbe_modes[match].mode_attr & 0x100))
var->vmode &= ~FB_VMODE_DOUBLE;
if ((var->vmode & FB_VMODE_INTERLACED) &&
!(par->vbe_modes[match].mode_attr & 0x200))
var->vmode &= ~FB_VMODE_INTERLACED;
uvesafb_check_limits(var, info);
var->xres_virtual = var->xres;
var->yres_virtual = (par->ypan) ?
info->fix.smem_len / mode->bytes_per_scan_line :
var->yres;
return 0;
}
static struct fb_ops uvesafb_ops = {
.owner = THIS_MODULE,
.fb_open = uvesafb_open,
.fb_release = uvesafb_release,
.fb_setcolreg = uvesafb_setcolreg,
.fb_setcmap = uvesafb_setcmap,
.fb_pan_display = uvesafb_pan_display,
.fb_blank = uvesafb_blank,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
.fb_check_var = uvesafb_check_var,
.fb_set_par = uvesafb_set_par,
};
static void __devinit uvesafb_init_info(struct fb_info *info,
struct vbe_mode_ib *mode)
{
unsigned int size_vmode;
unsigned int size_remap;
unsigned int size_total;
struct uvesafb_par *par = info->par;
int i, h;
info->pseudo_palette = ((u8 *)info->par + sizeof(struct uvesafb_par));
info->fix = uvesafb_fix;
info->fix.ypanstep = par->ypan ? 1 : 0;
info->fix.ywrapstep = (par->ypan > 1) ? 1 : 0;
/* Disable blanking if the user requested so. */
if (!blank)
info->fbops->fb_blank = NULL;
/*
* Find out how much IO memory is required for the mode with
* the highest resolution.
*/
size_remap = 0;
for (i = 0; i < par->vbe_modes_cnt; i++) {
h = par->vbe_modes[i].bytes_per_scan_line *
par->vbe_modes[i].y_res;
if (h > size_remap)
size_remap = h;
}
size_remap *= 2;
/*
* size_vmode -- that is the amount of memory needed for the
* used video mode, i.e. the minimum amount of
* memory we need.
*/
if (mode != NULL) {
size_vmode = info->var.yres * mode->bytes_per_scan_line;
} else {
size_vmode = info->var.yres * info->var.xres *
((info->var.bits_per_pixel + 7) >> 3);
}
/*
* size_total -- all video memory we have. Used for mtrr
* entries, resource allocation and bounds
* checking.
*/
size_total = par->vbe_ib.total_memory * 65536;
if (vram_total)
size_total = vram_total * 1024 * 1024;
if (size_total < size_vmode)
size_total = size_vmode;
/*
* size_remap -- the amount of video memory we are going to
* use for vesafb. With modern cards it is no
* option to simply use size_total as th
* wastes plenty of kernel address space.
*/
if (vram_remap)
size_remap = vram_remap * 1024 * 1024;
if (size_remap < size_vmode)
size_remap = size_vmode;
if (size_remap > size_total)
size_remap = size_total;
info->fix.smem_len = size_remap;
info->fix.smem_start = mode->phys_base_ptr;
/*
* We have to set yres_virtual here because when setup_var() was
* called, smem_len wasn't defined yet.
*/
info->var.yres_virtual = info->fix.smem_len /
mode->bytes_per_scan_line;
if (par->ypan && info->var.yres_virtual > info->var.yres) {
printk(KERN_INFO "uvesafb: scrolling: %s "
"using protected mode interface, "
"yres_virtual=%d\n",
(par->ypan > 1) ? "ywrap" : "ypan",
info->var.yres_virtual);
} else {
printk(KERN_INFO "uvesafb: scrolling: redraw\n");
info->var.yres_virtual = info->var.yres;
par->ypan = 0;
}
info->flags = FBINFO_FLAG_DEFAULT |
(par->ypan ? FBINFO_HWACCEL_YPAN : 0);
if (!par->ypan)
info->fbops->fb_pan_display = NULL;
}
static void __devinit uvesafb_init_mtrr(struct fb_info *info)
{
#ifdef CONFIG_MTRR
if (mtrr && !(info->fix.smem_start & (PAGE_SIZE - 1))) {
int temp_size = info->fix.smem_len;
unsigned int type = 0;
switch (mtrr) {
case 1:
type = MTRR_TYPE_UNCACHABLE;
break;
case 2:
type = MTRR_TYPE_WRBACK;
break;
case 3:
type = MTRR_TYPE_WRCOMB;
break;
case 4:
type = MTRR_TYPE_WRTHROUGH;
break;
default:
type = 0;
break;
}
if (type) {
int rc;
/* Find the largest power-of-two */
temp_size = roundup_pow_of_two(temp_size);
/* Try and find a power of two to add */
do {
rc = mtrr_add(info->fix.smem_start,
temp_size, type, 1);
temp_size >>= 1;
} while (temp_size >= PAGE_SIZE && rc == -EINVAL);
}
}
#endif /* CONFIG_MTRR */
}
static void __devinit uvesafb_ioremap(struct fb_info *info)
{
#ifdef CONFIG_X86
switch (mtrr) {
case 1: /* uncachable */
info->screen_base = ioremap_nocache(info->fix.smem_start, info->fix.smem_len);
break;
case 2: /* write-back */
info->screen_base = ioremap_cache(info->fix.smem_start, info->fix.smem_len);
break;
case 3: /* write-combining */
info->screen_base = ioremap_wc(info->fix.smem_start, info->fix.smem_len);
break;
case 4: /* write-through */
default:
info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
break;
}
#else
info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
#endif /* CONFIG_X86 */
}
static ssize_t uvesafb_show_vbe_ver(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
struct uvesafb_par *par = info->par;
return snprintf(buf, PAGE_SIZE, "%.4x\n", par->vbe_ib.vbe_version);
}
static DEVICE_ATTR(vbe_version, S_IRUGO, uvesafb_show_vbe_ver, NULL);
static ssize_t uvesafb_show_vbe_modes(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
struct uvesafb_par *par = info->par;
int ret = 0, i;
for (i = 0; i < par->vbe_modes_cnt && ret < PAGE_SIZE; i++) {
ret += snprintf(buf + ret, PAGE_SIZE - ret,
"%dx%d-%d, 0x%.4x\n",
par->vbe_modes[i].x_res, par->vbe_modes[i].y_res,
par->vbe_modes[i].depth, par->vbe_modes[i].mode_id);
}
return ret;
}
static DEVICE_ATTR(vbe_modes, S_IRUGO, uvesafb_show_vbe_modes, NULL);
static ssize_t uvesafb_show_vendor(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
struct uvesafb_par *par = info->par;
if (par->vbe_ib.oem_vendor_name_ptr)
return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
(&par->vbe_ib) + par->vbe_ib.oem_vendor_name_ptr);
else
return 0;
}
static DEVICE_ATTR(oem_vendor, S_IRUGO, uvesafb_show_vendor, NULL);
static ssize_t uvesafb_show_product_name(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
struct uvesafb_par *par = info->par;
if (par->vbe_ib.oem_product_name_ptr)
return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
(&par->vbe_ib) + par->vbe_ib.oem_product_name_ptr);
else
return 0;
}
static DEVICE_ATTR(oem_product_name, S_IRUGO, uvesafb_show_product_name, NULL);
static ssize_t uvesafb_show_product_rev(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
struct uvesafb_par *par = info->par;
if (par->vbe_ib.oem_product_rev_ptr)
return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
(&par->vbe_ib) + par->vbe_ib.oem_product_rev_ptr);
else
return 0;
}
static DEVICE_ATTR(oem_product_rev, S_IRUGO, uvesafb_show_product_rev, NULL);
static ssize_t uvesafb_show_oem_string(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
struct uvesafb_par *par = info->par;
if (par->vbe_ib.oem_string_ptr)
return snprintf(buf, PAGE_SIZE, "%s\n",
(char *)(&par->vbe_ib) + par->vbe_ib.oem_string_ptr);
else
return 0;
}
static DEVICE_ATTR(oem_string, S_IRUGO, uvesafb_show_oem_string, NULL);
static ssize_t uvesafb_show_nocrtc(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
struct uvesafb_par *par = info->par;
return snprintf(buf, PAGE_SIZE, "%d\n", par->nocrtc);
}
static ssize_t uvesafb_store_nocrtc(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
struct uvesafb_par *par = info->par;
if (count > 0) {
if (buf[0] == '0')
par->nocrtc = 0;
else
par->nocrtc = 1;
}
return count;
}
static DEVICE_ATTR(nocrtc, S_IRUGO | S_IWUSR, uvesafb_show_nocrtc,
uvesafb_store_nocrtc);
static struct attribute *uvesafb_dev_attrs[] = {
&dev_attr_vbe_version.attr,
&dev_attr_vbe_modes.attr,
&dev_attr_oem_vendor.attr,
&dev_attr_oem_product_name.attr,
&dev_attr_oem_product_rev.attr,
&dev_attr_oem_string.attr,
&dev_attr_nocrtc.attr,
NULL,
};
static struct attribute_group uvesafb_dev_attgrp = {
.name = NULL,
.attrs = uvesafb_dev_attrs,
};
static int __devinit uvesafb_probe(struct platform_device *dev)
{
struct fb_info *info;
struct vbe_mode_ib *mode = NULL;
struct uvesafb_par *par;
int err = 0, i;
info = framebuffer_alloc(sizeof(*par) + sizeof(u32) * 256, &dev->dev);
if (!info)
return -ENOMEM;
par = info->par;
err = uvesafb_vbe_init(info);
if (err) {
printk(KERN_ERR "uvesafb: vbe_init() failed with %d\n", err);
goto out;
}
info->fbops = &uvesafb_ops;
i = uvesafb_vbe_init_mode(info);
if (i < 0) {
err = -EINVAL;
goto out;
} else {
mode = &par->vbe_modes[i];
}
if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
err = -ENXIO;
goto out;
}
uvesafb_init_info(info, mode);
if (!request_region(0x3c0, 32, "uvesafb")) {
printk(KERN_ERR "uvesafb: request region 0x3c0-0x3e0 failed\n");
err = -EIO;
goto out_mode;
}
if (!request_mem_region(info->fix.smem_start, info->fix.smem_len,
"uvesafb")) {
printk(KERN_ERR "uvesafb: cannot reserve video memory at "
"0x%lx\n", info->fix.smem_start);
err = -EIO;
goto out_reg;
}
uvesafb_init_mtrr(info);
uvesafb_ioremap(info);
if (!info->screen_base) {
printk(KERN_ERR
"uvesafb: abort, cannot ioremap 0x%x bytes of video "
"memory at 0x%lx\n",
info->fix.smem_len, info->fix.smem_start);
err = -EIO;
goto out_mem;
}
platform_set_drvdata(dev, info);
if (register_framebuffer(info) < 0) {
printk(KERN_ERR
"uvesafb: failed to register framebuffer device\n");
err = -EINVAL;
goto out_unmap;
}
printk(KERN_INFO "uvesafb: framebuffer at 0x%lx, mapped to 0x%p, "
"using %dk, total %dk\n", info->fix.smem_start,
info->screen_base, info->fix.smem_len/1024,
par->vbe_ib.total_memory * 64);
printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
info->fix.id);
err = sysfs_create_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
if (err != 0)
printk(KERN_WARNING "fb%d: failed to register attributes\n",
info->node);
return 0;
out_unmap:
iounmap(info->screen_base);
out_mem:
release_mem_region(info->fix.smem_start, info->fix.smem_len);
out_reg:
release_region(0x3c0, 32);
out_mode:
if (!list_empty(&info->modelist))
fb_destroy_modelist(&info->modelist);
fb_destroy_modedb(info->monspecs.modedb);
fb_dealloc_cmap(&info->cmap);
out:
if (par->vbe_modes)
kfree(par->vbe_modes);
framebuffer_release(info);
return err;
}
static int uvesafb_remove(struct platform_device *dev)
{
struct fb_info *info = platform_get_drvdata(dev);
if (info) {
struct uvesafb_par *par = info->par;
sysfs_remove_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
unregister_framebuffer(info);
release_region(0x3c0, 32);
iounmap(info->screen_base);
release_mem_region(info->fix.smem_start, info->fix.smem_len);
fb_destroy_modedb(info->monspecs.modedb);
fb_dealloc_cmap(&info->cmap);
if (par) {
if (par->vbe_modes)
kfree(par->vbe_modes);
if (par->vbe_state_orig)
kfree(par->vbe_state_orig);
if (par->vbe_state_saved)
kfree(par->vbe_state_saved);
}
framebuffer_release(info);
}
return 0;
}
static struct platform_driver uvesafb_driver = {
.probe = uvesafb_probe,
.remove = uvesafb_remove,
.driver = {
.name = "uvesafb",
},
};
static struct platform_device *uvesafb_device;
#ifndef MODULE
static int __devinit uvesafb_setup(char *options)
{
char *this_opt;
if (!options || !*options)
return 0;
while ((this_opt = strsep(&options, ",")) != NULL) {
if (!*this_opt) continue;
if (!strcmp(this_opt, "redraw"))
ypan = 0;
else if (!strcmp(this_opt, "ypan"))
ypan = 1;
else if (!strcmp(this_opt, "ywrap"))
ypan = 2;
else if (!strcmp(this_opt, "vgapal"))
pmi_setpal = 0;
else if (!strcmp(this_opt, "pmipal"))
pmi_setpal = 1;
else if (!strncmp(this_opt, "mtrr:", 5))
mtrr = simple_strtoul(this_opt+5, NULL, 0);
else if (!strcmp(this_opt, "nomtrr"))
mtrr = 0;
else if (!strcmp(this_opt, "nocrtc"))
nocrtc = 1;
else if (!strcmp(this_opt, "noedid"))
noedid = 1;
else if (!strcmp(this_opt, "noblank"))
blank = 0;
else if (!strncmp(this_opt, "vtotal:", 7))
vram_total = simple_strtoul(this_opt + 7, NULL, 0);
else if (!strncmp(this_opt, "vremap:", 7))
vram_remap = simple_strtoul(this_opt + 7, NULL, 0);
else if (!strncmp(this_opt, "maxhf:", 6))
maxhf = simple_strtoul(this_opt + 6, NULL, 0);
else if (!strncmp(this_opt, "maxvf:", 6))
maxvf = simple_strtoul(this_opt + 6, NULL, 0);
else if (!strncmp(this_opt, "maxclk:", 7))
maxclk = simple_strtoul(this_opt + 7, NULL, 0);
else if (!strncmp(this_opt, "vbemode:", 8))
vbemode = simple_strtoul(this_opt + 8, NULL, 0);
else if (this_opt[0] >= '0' && this_opt[0] <= '9') {
mode_option = this_opt;
} else {
printk(KERN_WARNING
"uvesafb: unrecognized option %s\n", this_opt);
}
}
return 0;
}
#endif /* !MODULE */
static ssize_t show_v86d(struct device_driver *dev, char *buf)
{
return snprintf(buf, PAGE_SIZE, "%s\n", v86d_path);
}
static ssize_t store_v86d(struct device_driver *dev, const char *buf,
size_t count)
{
strncpy(v86d_path, buf, PATH_MAX);
return count;
}
static DRIVER_ATTR(v86d, S_IRUGO | S_IWUSR, show_v86d, store_v86d);
static int __devinit uvesafb_init(void)
{
int err;
#ifndef MODULE
char *option = NULL;
if (fb_get_options("uvesafb", &option))
return -ENODEV;
uvesafb_setup(option);
#endif
err = cn_add_callback(&uvesafb_cn_id, "uvesafb", uvesafb_cn_callback);
if (err)
return err;
err = platform_driver_register(&uvesafb_driver);
if (!err) {
uvesafb_device = platform_device_alloc("uvesafb", 0);
if (uvesafb_device)
err = platform_device_add(uvesafb_device);
else
err = -ENOMEM;
if (err) {
platform_device_put(uvesafb_device);
platform_driver_unregister(&uvesafb_driver);
cn_del_callback(&uvesafb_cn_id);
return err;
}
err = driver_create_file(&uvesafb_driver.driver,
&driver_attr_v86d);
if (err) {
printk(KERN_WARNING "uvesafb: failed to register "
"attributes\n");
err = 0;
}
}
return err;
}
module_init(uvesafb_init);
static void __devexit uvesafb_exit(void)
{
struct uvesafb_ktask *task;
if (v86d_started) {
task = uvesafb_prep();
if (task) {
task->t.flags = TF_EXIT;
uvesafb_exec(task);
uvesafb_free(task);
}
}
cn_del_callback(&uvesafb_cn_id);
driver_remove_file(&uvesafb_driver.driver, &driver_attr_v86d);
platform_device_unregister(uvesafb_device);
platform_driver_unregister(&uvesafb_driver);
}
module_exit(uvesafb_exit);
static int param_set_scroll(const char *val, const struct kernel_param *kp)
{
ypan = 0;
if (!strcmp(val, "redraw"))
ypan = 0;
else if (!strcmp(val, "ypan"))
ypan = 1;
else if (!strcmp(val, "ywrap"))
ypan = 2;
else
return -EINVAL;
return 0;
}
static struct kernel_param_ops param_ops_scroll = {
.set = param_set_scroll,
};
#define param_check_scroll(name, p) __param_check(name, p, void)
module_param_named(scroll, ypan, scroll, 0);
MODULE_PARM_DESC(scroll,
"Scrolling mode, set to 'redraw', 'ypan', or 'ywrap'");
module_param_named(vgapal, pmi_setpal, invbool, 0);
MODULE_PARM_DESC(vgapal, "Set palette using VGA registers");
module_param_named(pmipal, pmi_setpal, bool, 0);
MODULE_PARM_DESC(pmipal, "Set palette using PMI calls");
module_param(mtrr, uint, 0);
MODULE_PARM_DESC(mtrr,
"Memory Type Range Registers setting. Use 0 to disable.");
module_param(blank, bool, 0);
MODULE_PARM_DESC(blank, "Enable hardware blanking");
module_param(nocrtc, bool, 0);
MODULE_PARM_DESC(nocrtc, "Ignore CRTC timings when setting modes");
module_param(noedid, bool, 0);
MODULE_PARM_DESC(noedid,
"Ignore EDID-provided monitor limits when setting modes");
module_param(vram_remap, uint, 0);
MODULE_PARM_DESC(vram_remap, "Set amount of video memory to be used [MiB]");
module_param(vram_total, uint, 0);
MODULE_PARM_DESC(vram_total, "Set total amount of video memoery [MiB]");
module_param(maxclk, ushort, 0);
MODULE_PARM_DESC(maxclk, "Maximum pixelclock [MHz], overrides EDID data");
module_param(maxhf, ushort, 0);
MODULE_PARM_DESC(maxhf,
"Maximum horizontal frequency [kHz], overrides EDID data");
module_param(maxvf, ushort, 0);
MODULE_PARM_DESC(maxvf,
"Maximum vertical frequency [Hz], overrides EDID data");
module_param(mode_option, charp, 0);
MODULE_PARM_DESC(mode_option,
"Specify initial video mode as \"<xres>x<yres>[-<bpp>][@<refresh>]\"");
module_param(vbemode, ushort, 0);
MODULE_PARM_DESC(vbemode,
"VBE mode number to set, overrides the 'mode' option");
module_param_string(v86d, v86d_path, PATH_MAX, 0660);
MODULE_PARM_DESC(v86d, "Path to the v86d userspace helper.");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Michal Januszewski <spock@gentoo.org>");
MODULE_DESCRIPTION("Framebuffer driver for VBE2.0+ compliant graphics boards");
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