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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 "util.h" // dprintf
#include "ioport.h" // outb
#include "pic.h" // eoi_pic2
#include "biosvar.h" // struct bios_data_area_s
#include "bregs.h" // struct bregs
#include "acpi.h" // find_resume_vector
// Reset DMA controller
void
init_dma()
{
// first reset the DMA controllers
outb(0, PORT_DMA1_MASTER_CLEAR);
outb(0, PORT_DMA2_MASTER_CLEAR);
// then initialize the DMA controllers
outb(0xc0, PORT_DMA2_MODE_REG);
outb(0x00, PORT_DMA2_MASK_REG);
}
// Handler for post calls that look like a resume.
void VISIBLE16
handle_resume(u8 status)
{
init_dma();
debug_serial_setup();
dprintf(1, "In resume (status=%d)\n", status);
switch (status) {
case 0xfe:
if (CONFIG_S3_RESUME) {
// S3 resume request. Jump to 32bit mode to handle the resume.
asm volatile(
"movw %w1, %%ss\n"
"movl %0, %%esp\n"
"pushl $s3_resume\n"
"jmp transition32\n"
: : "i"(BUILD_S3RESUME_STACK_ADDR), "r"(0)
);
break;
}
// NO BREAK
case 0x00:
case 0x09:
case 0x0d ... 0xfd:
case 0xff:
// Normal post - now that status has been cleared a reset will
// run regular boot code..
reset_vector();
break;
case 0x05:
// flush keyboard (issue EOI) and jump via 40h:0067h
eoi_pic2();
// NO BREAK
case 0x0a:
#define BDA_JUMP_IP (((struct bios_data_area_s *)0)->jump_ip)
// resume execution by jump via 40h:0067h
asm volatile(
"movw %w1, %%ds\n"
"ljmpw *%0\n"
: : "m"(BDA_JUMP_IP), "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_IP), "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_IP), "r"(SEG_BDA)
);
break;
}
panic("Unimplemented shutdown status: %02x\n", status);
}
void VISIBLE32
s3_resume()
{
if (!CONFIG_S3_RESUME)
panic("S3 resume support not compiled in.\n");
dprintf(1, "In 32bit resume\n");
smm_init();
make_bios_readonly();
u32 s3_resume_vector = find_resume_vector();
// Invoke the resume vector.
struct bregs br;
memset(&br, 0, sizeof(br));
if (s3_resume_vector) {
dprintf(1, "Jump to resume vector (%x)\n", s3_resume_vector);
br.ip = FLATPTR_TO_OFFSET(s3_resume_vector);
br.cs = FLATPTR_TO_SEG(s3_resume_vector);
} else {
dprintf(1, "No resume vector set!\n");
// Jump to the post vector to restart with a normal boot.
br.ip = (u32)reset_vector - BUILD_BIOS_ADDR;
br.cs = SEG_BIOS;
}
call16big(&br);
}
// Ughh - some older gcc compilers have a bug which causes VISIBLE32
// functions to not be exported as global variables.
asm(".global s3_resume");
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