238b706da1
Make "struct ist_info" valid on both i386 and x86-64, and use the structure by name in the setup code. Additionally, "Intel SpeedStep IST" is redundant, refer to it as IST consistently. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
161 lines
3.7 KiB
C
161 lines
3.7 KiB
C
/* -*- linux-c -*- ------------------------------------------------------- *
|
|
*
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
* Copyright 2007 rPath, Inc. - All Rights Reserved
|
|
*
|
|
* This file is part of the Linux kernel, and is made available under
|
|
* the terms of the GNU General Public License version 2.
|
|
*
|
|
* ----------------------------------------------------------------------- */
|
|
|
|
/*
|
|
* arch/i386/boot/main.c
|
|
*
|
|
* Main module for the real-mode kernel code
|
|
*/
|
|
|
|
#include "boot.h"
|
|
|
|
struct boot_params boot_params __attribute__((aligned(16)));
|
|
|
|
char *HEAP = _end;
|
|
char *heap_end = _end; /* Default end of heap = no heap */
|
|
|
|
/*
|
|
* Copy the header into the boot parameter block. Since this
|
|
* screws up the old-style command line protocol, adjust by
|
|
* filling in the new-style command line pointer instead.
|
|
*/
|
|
#define OLD_CL_MAGIC 0xA33F
|
|
#define OLD_CL_ADDRESS 0x20
|
|
|
|
static void copy_boot_params(void)
|
|
{
|
|
struct old_cmdline {
|
|
u16 cl_magic;
|
|
u16 cl_offset;
|
|
};
|
|
const struct old_cmdline * const oldcmd =
|
|
(const struct old_cmdline *)OLD_CL_ADDRESS;
|
|
|
|
BUILD_BUG_ON(sizeof boot_params != 4096);
|
|
memcpy(&boot_params.hdr, &hdr, sizeof hdr);
|
|
|
|
if (!boot_params.hdr.cmd_line_ptr &&
|
|
oldcmd->cl_magic == OLD_CL_MAGIC) {
|
|
/* Old-style command line protocol. */
|
|
u16 cmdline_seg;
|
|
|
|
/* Figure out if the command line falls in the region
|
|
of memory that an old kernel would have copied up
|
|
to 0x90000... */
|
|
if (oldcmd->cl_offset < boot_params.hdr.setup_move_size)
|
|
cmdline_seg = ds();
|
|
else
|
|
cmdline_seg = 0x9000;
|
|
|
|
boot_params.hdr.cmd_line_ptr =
|
|
(cmdline_seg << 4) + oldcmd->cl_offset;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Set the keyboard repeat rate to maximum. Unclear why this
|
|
* is done here; this might be possible to kill off as stale code.
|
|
*/
|
|
static void keyboard_set_repeat(void)
|
|
{
|
|
u16 ax = 0x0305;
|
|
u16 bx = 0;
|
|
asm volatile("int $0x16"
|
|
: "+a" (ax), "+b" (bx)
|
|
: : "ecx", "edx", "esi", "edi");
|
|
}
|
|
|
|
/*
|
|
* Get Intel SpeedStep (IST) information.
|
|
*/
|
|
static void query_ist(void)
|
|
{
|
|
asm("int $0x15"
|
|
: "=a" (boot_params.ist_info.signature),
|
|
"=b" (boot_params.ist_info.command),
|
|
"=c" (boot_params.ist_info.event),
|
|
"=d" (boot_params.ist_info.perf_level)
|
|
: "a" (0x0000e980), /* IST Support */
|
|
"d" (0x47534943)); /* Request value */
|
|
}
|
|
|
|
/*
|
|
* Tell the BIOS what CPU mode we intend to run in.
|
|
*/
|
|
static void set_bios_mode(void)
|
|
{
|
|
#ifdef CONFIG_X86_64
|
|
u32 eax, ebx;
|
|
|
|
eax = 0xec00;
|
|
ebx = 2;
|
|
asm volatile("int $0x15"
|
|
: "+a" (eax), "+b" (ebx)
|
|
: : "ecx", "edx", "esi", "edi");
|
|
#endif
|
|
}
|
|
|
|
void main(void)
|
|
{
|
|
/* First, copy the boot header into the "zeropage" */
|
|
copy_boot_params();
|
|
|
|
/* End of heap check */
|
|
if (boot_params.hdr.loadflags & CAN_USE_HEAP) {
|
|
heap_end = (char *)(boot_params.hdr.heap_end_ptr
|
|
+0x200-STACK_SIZE);
|
|
} else {
|
|
/* Boot protocol 2.00 only, no heap available */
|
|
puts("WARNING: Ancient bootloader, some functionality "
|
|
"may be limited!\n");
|
|
}
|
|
|
|
/* Make sure we have all the proper CPU support */
|
|
if (validate_cpu()) {
|
|
puts("Unable to boot - please use a kernel appropriate "
|
|
"for your CPU.\n");
|
|
die();
|
|
}
|
|
|
|
/* Tell the BIOS what CPU mode we intend to run in. */
|
|
set_bios_mode();
|
|
|
|
/* Detect memory layout */
|
|
detect_memory();
|
|
|
|
/* Set keyboard repeat rate (why?) */
|
|
keyboard_set_repeat();
|
|
|
|
/* Set the video mode */
|
|
set_video();
|
|
|
|
/* Query MCA information */
|
|
query_mca();
|
|
|
|
/* Voyager */
|
|
#ifdef CONFIG_X86_VOYAGER
|
|
query_voyager();
|
|
#endif
|
|
|
|
/* Query Intel SpeedStep (IST) information */
|
|
query_ist();
|
|
|
|
/* Query APM information */
|
|
#if defined(CONFIG_APM) || defined(CONFIG_APM_MODULE)
|
|
query_apm_bios();
|
|
#endif
|
|
|
|
/* Query EDD information */
|
|
#if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
|
|
query_edd();
|
|
#endif
|
|
/* Do the last things and invoke protected mode */
|
|
go_to_protected_mode();
|
|
}
|