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https://github.com/xemu-project/xemu.git
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7d977de7e1
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@661 c046a42c-6fe2-441c-8c8c-71466251a162
369 lines
9.0 KiB
C
369 lines
9.0 KiB
C
/*
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* QEMU DMA emulation
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*
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* Copyright (c) 2003 Vassili Karpov (malc)
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <inttypes.h>
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#include "cpu.h"
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#include "vl.h"
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#define log(...) fprintf (stderr, "dma: " __VA_ARGS__)
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#ifdef DEBUG_DMA
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#define lwarn(...) fprintf (stderr, "dma: " __VA_ARGS__)
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#define linfo(...) fprintf (stderr, "dma: " __VA_ARGS__)
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#define ldebug(...) fprintf (stderr, "dma: " __VA_ARGS__)
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#else
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#define lwarn(...)
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#define linfo(...)
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#define ldebug(...)
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#endif
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#define LENOFA(a) ((int) (sizeof(a)/sizeof(a[0])))
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struct dma_regs {
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int now[2];
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uint16_t base[2];
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uint8_t mode;
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uint8_t page;
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uint8_t dack;
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uint8_t eop;
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DMA_transfer_handler transfer_handler;
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void *opaque;
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};
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#define ADDR 0
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#define COUNT 1
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static struct dma_cont {
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uint8_t status;
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uint8_t command;
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uint8_t mask;
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uint8_t flip_flop;
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struct dma_regs regs[4];
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} dma_controllers[2];
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enum {
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CMD_MEMORY_TO_MEMORY = 0x01,
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CMD_FIXED_ADDRESS = 0x02,
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CMD_BLOCK_CONTROLLER = 0x04,
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CMD_COMPRESSED_TIME = 0x08,
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CMD_CYCLIC_PRIORITY = 0x10,
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CMD_EXTENDED_WRITE = 0x20,
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CMD_LOW_DREQ = 0x40,
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CMD_LOW_DACK = 0x80,
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CMD_NOT_SUPPORTED = CMD_MEMORY_TO_MEMORY | CMD_FIXED_ADDRESS
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| CMD_COMPRESSED_TIME | CMD_CYCLIC_PRIORITY | CMD_EXTENDED_WRITE
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| CMD_LOW_DREQ | CMD_LOW_DACK
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};
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static void write_page (void *opaque, uint32_t nport, uint32_t data)
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{
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int ichan;
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int ncont;
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static int channels[8] = {-1, 2, 3, 1, -1, -1, -1, 0};
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ncont = nport > 0x87;
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ichan = channels[nport - 0x80 - (ncont << 3)];
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if (-1 == ichan) {
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log ("invalid channel %#x %#x\n", nport, data);
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return;
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}
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dma_controllers[ncont].regs[ichan].page = data;
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}
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static void init_chan (int ncont, int ichan)
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{
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struct dma_regs *r;
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r = dma_controllers[ncont].regs + ichan;
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r->now[ADDR] = r->base[0] << ncont;
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r->now[COUNT] = 0;
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}
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static inline int getff (int ncont)
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{
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int ff;
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ff = dma_controllers[ncont].flip_flop;
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dma_controllers[ncont].flip_flop = !ff;
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return ff;
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}
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static uint32_t read_chan (void *opaque, uint32_t nport)
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{
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int ff;
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int ncont, ichan, nreg;
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struct dma_regs *r;
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int val;
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ncont = nport > 7;
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ichan = (nport >> (1 + ncont)) & 3;
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nreg = (nport >> ncont) & 1;
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r = dma_controllers[ncont].regs + ichan;
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ff = getff (ncont);
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if (nreg)
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val = (r->base[COUNT] << ncont) - r->now[COUNT];
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else
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val = r->now[ADDR] + r->now[COUNT];
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return (val >> (ncont + (ff << 3))) & 0xff;
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}
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static void write_chan (void *opaque, uint32_t nport, uint32_t data)
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{
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int ncont, ichan, nreg;
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struct dma_regs *r;
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ncont = nport > 7;
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ichan = (nport >> (1 + ncont)) & 3;
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nreg = (nport >> ncont) & 1;
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r = dma_controllers[ncont].regs + ichan;
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if (getff (ncont)) {
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r->base[nreg] = (r->base[nreg] & 0xff) | ((data << 8) & 0xff00);
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init_chan (ncont, ichan);
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} else {
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r->base[nreg] = (r->base[nreg] & 0xff00) | (data & 0xff);
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}
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}
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static void write_cont (void *opaque, uint32_t nport, uint32_t data)
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{
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int iport, ichan, ncont;
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struct dma_cont *d;
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ncont = nport > 0xf;
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ichan = -1;
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d = dma_controllers + ncont;
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if (ncont) {
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iport = ((nport - 0xd0) >> 1) + 8;
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}
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else {
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iport = nport;
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}
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switch (iport) {
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case 8: /* command */
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if (data && (data | CMD_NOT_SUPPORTED)) {
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log ("command %#x not supported\n", data);
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goto error;
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}
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d->command = data;
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break;
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case 9:
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ichan = data & 3;
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if (data & 4) {
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d->status |= 1 << (ichan + 4);
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}
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else {
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d->status &= ~(1 << (ichan + 4));
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}
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d->status &= ~(1 << ichan);
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break;
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case 0xa: /* single mask */
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if (data & 4)
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d->mask |= 1 << (data & 3);
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else
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d->mask &= ~(1 << (data & 3));
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break;
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case 0xb: /* mode */
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{
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ichan = data & 3;
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#ifdef DEBUG_DMA
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int op;
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int ai;
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int dir;
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int opmode;
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op = (data >> 2) & 3;
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ai = (data >> 4) & 1;
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dir = (data >> 5) & 1;
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opmode = (data >> 6) & 3;
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linfo ("ichan %d, op %d, ai %d, dir %d, opmode %d\n",
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ichan, op, ai, dir, opmode);
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#endif
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d->regs[ichan].mode = data;
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break;
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}
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case 0xc: /* clear flip flop */
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d->flip_flop = 0;
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break;
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case 0xd: /* reset */
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d->flip_flop = 0;
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d->mask = ~0;
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d->status = 0;
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d->command = 0;
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break;
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case 0xe: /* clear mask for all channels */
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d->mask = 0;
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break;
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case 0xf: /* write mask for all channels */
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d->mask = data;
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break;
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default:
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log ("dma: unknown iport %#x\n", iport);
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goto error;
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}
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#ifdef DEBUG_DMA
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if (0xc != iport) {
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linfo ("nport %#06x, ncont %d, ichan % 2d, val %#06x\n",
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nport, d != dma_controllers, ichan, data);
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}
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#endif
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return;
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error:
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abort ();
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}
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int DMA_get_channel_mode (int nchan)
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{
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return dma_controllers[nchan > 3].regs[nchan & 3].mode;
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}
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void DMA_hold_DREQ (int nchan)
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{
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int ncont, ichan;
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ncont = nchan > 3;
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ichan = nchan & 3;
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linfo ("held cont=%d chan=%d\n", ncont, ichan);
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dma_controllers[ncont].status |= 1 << (ichan + 4);
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}
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void DMA_release_DREQ (int nchan)
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{
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int ncont, ichan;
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ncont = nchan > 3;
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ichan = nchan & 3;
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linfo ("released cont=%d chan=%d\n", ncont, ichan);
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dma_controllers[ncont].status &= ~(1 << (ichan + 4));
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}
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static void channel_run (int ncont, int ichan)
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{
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struct dma_regs *r;
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int n;
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target_ulong addr;
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/* int ai, dir; */
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r = dma_controllers[ncont].regs + ichan;
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/* ai = r->mode & 16; */
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/* dir = r->mode & 32 ? -1 : 1; */
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addr = (r->page << 16) | r->now[ADDR];
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n = r->transfer_handler (r->opaque, addr,
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(r->base[COUNT] << ncont) + (1 << ncont));
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r->now[COUNT] = n;
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ldebug ("dma_pos %d size %d\n",
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n, (r->base[1] << ncont) + (1 << ncont));
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}
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void DMA_run (void)
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{
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struct dma_cont *d;
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int icont, ichan;
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d = dma_controllers;
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for (icont = 0; icont < 2; icont++, d++) {
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for (ichan = 0; ichan < 4; ichan++) {
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int mask;
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mask = 1 << ichan;
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if ((0 == (d->mask & mask)) && (0 != (d->status & (mask << 4))))
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channel_run (icont, ichan);
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}
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}
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}
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void DMA_register_channel (int nchan,
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DMA_transfer_handler transfer_handler,
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void *opaque)
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{
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struct dma_regs *r;
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int ichan, ncont;
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ncont = nchan > 3;
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ichan = nchan & 3;
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r = dma_controllers[ncont].regs + ichan;
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r->transfer_handler = transfer_handler;
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r->opaque = opaque;
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}
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/* request the emulator to transfer a new DMA memory block ASAP */
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void DMA_schedule(int nchan)
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{
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cpu_interrupt(cpu_single_env, CPU_INTERRUPT_EXIT);
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}
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void DMA_init (void)
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{
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int i;
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int page_port_list[] = { 0x1, 0x2, 0x3, 0x7 };
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for (i = 0; i < 8; i++) {
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register_ioport_write (i, 1, 1, write_chan, NULL);
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register_ioport_write (0xc0 + (i << 1), 1, 1, write_chan, NULL);
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register_ioport_read (i, 1, 1, read_chan, NULL);
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register_ioport_read (0xc0 + (i << 1), 1, 1, read_chan, NULL);
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}
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for (i = 0; i < LENOFA (page_port_list); i++) {
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register_ioport_write (page_port_list[i] + 0x80, 1, 1, write_page, NULL);
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register_ioport_write (page_port_list[i] + 0x88, 1, 1, write_page, NULL);
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}
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for (i = 0; i < 8; i++) {
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register_ioport_write (i + 8, 1, 1, write_cont, NULL);
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register_ioport_write (0xd0 + (i << 1), 1, 1, write_cont, NULL);
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}
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write_cont (NULL, 0x0d, 0);
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write_cont (NULL, 0xda, 0);
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}
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