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// Basic support for apmbios callbacks.
//
// Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
// Copyright (C) 2005 Struan Bartlett
// Copyright (C) 2004 Fabrice Bellard
//
// This file may be distributed under the terms of the GNU LGPLv3 license.
#include "farptr.h" // GET_VAR
#include "bregs.h" // struct bregs
#include "ioport.h" // outb
#include "util.h" // irq_enable
#include "config.h" // CONFIG_*
#include "biosvar.h" // GET_GLOBAL
static void
out_str(const char *str_cs)
{
if (CONFIG_COREBOOT) {
dprintf(1, "APM request '%s'\n", str_cs);
return;
}
u8 *s = (u8*)str_cs;
for (;;) {
u8 c = GET_GLOBAL(*s);
if (!c)
break;
outb(c, PORT_BIOS_APM);
s++;
}
}
// APM installation check
static void
handle_155300(struct bregs *regs)
{
regs->ah = 1; // APM major version
regs->al = 2; // APM minor version
regs->bh = 'P';
regs->bl = 'M';
// bit 0 : 16 bit interface supported
// bit 1 : 32 bit interface supported
regs->cx = 0x03;
set_success(regs);
}
// APM real mode interface connect
static void
handle_155301(struct bregs *regs)
{
set_success(regs);
}
// Assembler entry points defined in romlayout.S
extern void apm16protected_entry();
extern void apm32protected_entry();
// APM 16 bit protected mode interface connect
static void
handle_155302(struct bregs *regs)
{
regs->bx = (u32)apm16protected_entry;
regs->ax = SEG_BIOS; // 16 bit code segment base
regs->si = 0xfff0; // 16 bit code segment size
regs->cx = SEG_BIOS; // data segment address
regs->di = 0xfff0; // data segment length
set_success(regs);
}
// APM 32 bit protected mode interface connect
static void
handle_155303(struct bregs *regs)
{
regs->ax = SEG_BIOS; // 32 bit code segment base
regs->ebx = (u32)apm32protected_entry;
regs->cx = SEG_BIOS; // 16 bit code segment base
// 32 bit code segment size (low 16 bits)
// 16 bit code segment size (high 16 bits)
regs->esi = 0xfff0fff0;
regs->dx = SEG_BIOS; // data segment address
regs->di = 0xfff0; // data segment length
set_success(regs);
}
// APM interface disconnect
static void
handle_155304(struct bregs *regs)
{
set_success(regs);
}
// APM cpu idle
static void
handle_155305(struct bregs *regs)
{
irq_enable();
hlt();
set_success(regs);
}
// APM cpu busy
static void
handle_155306(struct bregs *regs)
{
set_success(regs);
}
// APM Set Power State
static void
handle_155307(struct bregs *regs)
{
if (regs->bx != 1) {
set_success(regs);
return;
}
switch (regs->cx) {
case 1:
out_str("Standby");
break;
case 2:
out_str("Suspend");
break;
case 3:
irq_disable();
out_str("Shutdown");
for (;;)
hlt();
break;
}
set_success(regs);
}
static void
handle_155308(struct bregs *regs)
{
set_success(regs);
}
// Get Power Status
static void
handle_15530a(struct bregs *regs)
{
regs->bh = 0x01; // on line
regs->bl = 0xff; // unknown battery status
regs->ch = 0x80; // no system battery
regs->cl = 0xff; // unknown remaining time
regs->dx = 0xffff; // unknown remaining time
regs->si = 0x00; // zero battery
set_success(regs);
}
#define RET_ENOEVENT 0x80
// Get PM Event
static void
handle_15530b(struct bregs *regs)
{
set_code_fail_silent(regs, RET_ENOEVENT);
}
// APM Driver Version
static void
handle_15530e(struct bregs *regs)
{
regs->ah = 1;
regs->al = 2;
set_success(regs);
}
// APM Engage / Disengage
static void
handle_15530f(struct bregs *regs)
{
set_success(regs);
}
// APM Get Capabilities
static void
handle_155310(struct bregs *regs)
{
regs->bl = 0;
regs->cx = 0;
set_success(regs);
}
static void
handle_1553XX(struct bregs *regs)
{
set_fail(regs);
}
void VISIBLE16
handle_1553(struct bregs *regs)
{
if (! CONFIG_APMBIOS) {
set_code_fail(regs, RET_EUNSUPPORTED);
return;
}
//debug_stub(regs);
switch (regs->al) {
case 0x00: handle_155300(regs); break;
case 0x01: handle_155301(regs); break;
case 0x02: handle_155302(regs); break;
case 0x03: handle_155303(regs); break;
case 0x04: handle_155304(regs); break;
case 0x05: handle_155305(regs); break;
case 0x06: handle_155306(regs); break;
case 0x07: handle_155307(regs); break;
case 0x08: handle_155308(regs); break;
case 0x0a: handle_15530a(regs); break;
case 0x0b: handle_15530b(regs); break;
case 0x0e: handle_15530e(regs); break;
case 0x0f: handle_15530f(regs); break;
case 0x10: handle_155310(regs); break;
default: handle_1553XX(regs); break;
}
}
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