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bff06d5522
Instead of all of this cpu-specific code to remap the kernel
to the correct location, use portable firmware calls to do
this instead.
What we do now is the following in position independant
assembler:
chosen_node = prom_finddevice("/chosen");
prom_mmu_ihandle_cache = prom_getint(chosen_node, "mmu");
vaddr = 4MB_ALIGN(current_text_addr());
prom_translate(vaddr, &paddr_high, &paddr_low, &mode);
prom_boot_mapping_mode = mode;
prom_boot_mapping_phys_high = paddr_high;
prom_boot_mapping_phys_low = paddr_low;
prom_map(-1, 8 * 1024 * 1024, KERNBASE, paddr_low);
and that replaces the massive amount of by-hand TLB probing and
programming we used to do here.
The new code should also handle properly the case where the kernel
is mapped at the correct address already (think: future kexec
support).
Consequently, the bulk of remap_kernel() dies as does the entirety
of arch/sparc64/prom/map.S
We try to share some strings in the PROM library with the ones used
at bootup, and while we're here mark input strings to oplib.h routines
with "const" when appropriate.
There are many more simplifications now possible. For one thing, we
can consolidate the two copies we now have of a lot of cpu setup code
sitting in head.S and trampoline.S.
This is a significant step towards CONFIG_DEBUG_PAGEALLOC support.
Signed-off-by: David S. Miller <davem@davemloft.net>
147 lines
3.5 KiB
C
147 lines
3.5 KiB
C
/* $Id: console.c,v 1.9 1997/10/29 07:41:43 ecd Exp $
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* console.c: Routines that deal with sending and receiving IO
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* to/from the current console device using the PROM.
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*
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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* Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <asm/openprom.h>
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#include <asm/oplib.h>
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#include <asm/system.h>
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#include <linux/string.h>
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extern int prom_stdin, prom_stdout;
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/* Non blocking get character from console input device, returns -1
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* if no input was taken. This can be used for polling.
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*/
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__inline__ int
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prom_nbgetchar(void)
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{
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char inc;
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if (p1275_cmd("read", P1275_ARG(1,P1275_ARG_OUT_BUF)|
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P1275_INOUT(3,1),
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prom_stdin, &inc, P1275_SIZE(1)) == 1)
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return inc;
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else
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return -1;
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}
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/* Non blocking put character to console device, returns -1 if
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* unsuccessful.
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*/
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__inline__ int
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prom_nbputchar(char c)
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{
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char outc;
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outc = c;
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if (p1275_cmd("write", P1275_ARG(1,P1275_ARG_IN_BUF)|
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P1275_INOUT(3,1),
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prom_stdout, &outc, P1275_SIZE(1)) == 1)
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return 0;
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else
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return -1;
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}
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/* Blocking version of get character routine above. */
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char
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prom_getchar(void)
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{
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int character;
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while((character = prom_nbgetchar()) == -1) ;
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return (char) character;
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}
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/* Blocking version of put character routine above. */
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void
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prom_putchar(char c)
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{
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prom_nbputchar(c);
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return;
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}
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void
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prom_puts(const char *s, int len)
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{
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p1275_cmd("write", P1275_ARG(1,P1275_ARG_IN_BUF)|
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P1275_INOUT(3,1),
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prom_stdout, s, P1275_SIZE(len));
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}
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/* Query for input device type */
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enum prom_input_device
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prom_query_input_device(void)
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{
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int st_p;
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char propb[64];
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st_p = prom_inst2pkg(prom_stdin);
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if(prom_node_has_property(st_p, "keyboard"))
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return PROMDEV_IKBD;
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prom_getproperty(st_p, "device_type", propb, sizeof(propb));
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if(strncmp(propb, "serial", 6))
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return PROMDEV_I_UNK;
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/* FIXME: Is there any better way how to find out? */
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memset(propb, 0, sizeof(propb));
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st_p = prom_finddevice ("/options");
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prom_getproperty(st_p, "input-device", propb, sizeof(propb));
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/*
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* If we get here with propb == 'keyboard', we are on ttya, as
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* the PROM defaulted to this due to 'no input device'.
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*/
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if (!strncmp(propb, "keyboard", 8))
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return PROMDEV_ITTYA;
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if (strncmp (propb, "tty", 3) || !propb[3])
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return PROMDEV_I_UNK;
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switch (propb[3]) {
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case 'a': return PROMDEV_ITTYA;
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case 'b': return PROMDEV_ITTYB;
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default: return PROMDEV_I_UNK;
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}
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}
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/* Query for output device type */
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enum prom_output_device
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prom_query_output_device(void)
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{
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int st_p;
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char propb[64];
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int propl;
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st_p = prom_inst2pkg(prom_stdout);
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propl = prom_getproperty(st_p, "device_type", propb, sizeof(propb));
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if (propl >= 0 && propl == sizeof("display") &&
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strncmp("display", propb, sizeof("display")) == 0)
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return PROMDEV_OSCREEN;
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if(strncmp("serial", propb, 6))
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return PROMDEV_O_UNK;
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/* FIXME: Is there any better way how to find out? */
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memset(propb, 0, sizeof(propb));
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st_p = prom_finddevice ("/options");
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prom_getproperty(st_p, "output-device", propb, sizeof(propb));
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/*
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* If we get here with propb == 'screen', we are on ttya, as
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* the PROM defaulted to this due to 'no input device'.
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*/
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if (!strncmp(propb, "screen", 6))
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return PROMDEV_OTTYA;
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if (strncmp (propb, "tty", 3) || !propb[3])
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return PROMDEV_O_UNK;
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switch (propb[3]) {
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case 'a': return PROMDEV_OTTYA;
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case 'b': return PROMDEV_OTTYB;
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default: return PROMDEV_O_UNK;
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}
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}
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