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// Code for handling calls to "post" that are resume related.
//
// Copyright (C) 2008,2009 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU LGPLv3 license.
#include "bregs.h" // struct bregs
#include "config.h" // CONFIG_*
#include "farptr.h" // FLATPTR_TO_SEGOFF
#include "hw/pci.h" // pci_reboot
#include "hw/pic.h" // pic_eoi2
#include "hw/ps2port.h" // i8042_reboot
#include "hw/rtc.h" // rtc_read
#include "output.h" // dprintf
#include "stacks.h" // farcall16big
#include "std/bda.h" // struct bios_data_area_s
#include "string.h" // memset
#include "util.h" // dma_setup
// Handler for post calls that look like a resume.
void VISIBLE16
handle_resume(void)
{
ASSERT16();
int status = rtc_read(CMOS_RESET_CODE);
rtc_write(CMOS_RESET_CODE, 0);
dprintf(1, "In resume (status=%d)\n", status);
dma_setup();
switch (status) {
case 0x01 ... 0x04:
case 0x06 ... 0x09:
panic("Unimplemented shutdown status: %02x\n", status);
case 0x05:
// flush keyboard (issue EOI) and jump via 40h:0067h
pic_eoi2();
// NO BREAK
case 0x0a:
#define BDA_JUMP (((struct bios_data_area_s *)0)->jump)
// resume execution by jump via 40h:0067h
asm volatile(
"movw %w1, %%ds\n"
"ljmpw *%0\n"
: : "m"(BDA_JUMP), "r"(SEG_BDA)
);
break;
case 0x0b:
// resume execution via IRET via 40h:0067h
asm volatile(
"movw %w1, %%ds\n"
"lssw %0, %%sp\n"
"iretw\n"
: : "m"(BDA_JUMP), "r"(SEG_BDA)
);
break;
case 0x0c:
// resume execution via RETF via 40h:0067h
asm volatile(
"movw %w1, %%ds\n"
"lssw %0, %%sp\n"
"lretw\n"
: : "m"(BDA_JUMP), "r"(SEG_BDA)
);
break;
default:
break;
}
// Not a 16bit resume - do remaining checks in 32bit mode
asm volatile(
"movw %w1, %%ss\n"
"movl %0, %%esp\n"
"movl $_cfunc32flat_handle_resume32, %%edx\n"
"jmp transition32\n"
: : "i"(BUILD_S3RESUME_STACK_ADDR), "r"(0), "a"(status)
);
}
// Handle an S3 resume event
static void
s3_resume(void)
{
if (!CONFIG_S3_RESUME)
return;
u32 s3_resume_vector = find_resume_vector();
if (!s3_resume_vector) {
dprintf(1, "No resume vector set!\n");
return;
}
pic_setup();
smm_setup();
pci_resume();
s3_resume_vga();
make_bios_readonly();
// Invoke the resume vector.
struct bregs br;
memset(&br, 0, sizeof(br));
dprintf(1, "Jump to resume vector (%x)\n", s3_resume_vector);
br.code = FLATPTR_TO_SEGOFF((void*)s3_resume_vector);
farcall16big(&br);
}
u8 HaveAttemptedReboot VARLOW;
// Attempt to invoke a hard-reboot.
static void
tryReboot(void)
{
if (HaveAttemptedReboot) {
// Hard reboot has failed - try to shutdown machine.
dprintf(1, "Unable to hard-reboot machine - attempting shutdown.\n");
apm_shutdown();
}
HaveAttemptedReboot = 1;
dprintf(1, "Attempting a hard reboot\n");
// Setup for reset on qemu.
qemu_prep_reset();
// Reboot using ACPI RESET_REG
acpi_reboot();
// Try keyboard controller reboot.
i8042_reboot();
// Try PCI 0xcf9 reboot
pci_reboot();
// Try triple fault
asm volatile("int3");
panic("Could not reboot");
}
void VISIBLE32FLAT
handle_resume32(int status)
{
ASSERT32FLAT();
dprintf(1, "In 32bit resume\n");
if (status == 0xfe)
s3_resume();
// Must be a soft reboot - invoke a hard reboot.
tryReboot();
}
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