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ableos/ableos/shitty_code_to_rewrite/shutdown_in_c.c
Able 911b37533b ableOS build system
2021-11-16 00:09:27 -06:00

303 lines
7.6 KiB
C
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// //
// // here is the slighlty complicated ACPI poweroff code
// //
#include <stddef.h>
#include <print.h>
#include <string.h>
#include <io.h>
#include <time.h>
dword *SMI_CMD;
byte ACPI_ENABLE;
byte ACPI_DISABLE;
dword *PM1a_CNT;
dword *PM1b_CNT;
word SLP_TYPa;
word SLP_TYPb;
word SLP_EN;
word SCI_EN;
byte PM1_CNT_LEN;
struct RSDPtr
{
byte Signature[8];
byte CheckSum;
byte OemID[6];
byte Revision;
dword *RsdtAddress;
};
struct FACP
{
byte Signature[4];
dword Length;
byte unneded1[40 - 8];
dword *DSDT;
byte unneded2[48 - 44];
dword *SMI_CMD;
byte ACPI_ENABLE;
byte ACPI_DISABLE;
byte unneded3[64 - 54];
dword *PM1a_CNT_BLK;
dword *PM1b_CNT_BLK;
byte unneded4[89 - 72];
byte PM1_CNT_LEN;
};
// check if the given address has a valid header
unsigned int *acpiCheckRSDPtr(unsigned int *ptr)
{
char *sig = "RSD PTR ";
struct RSDPtr *rsdp = (struct RSDPtr *)ptr;
byte *bptr;
byte check = 0;
int i;
if (memcmp(sig, rsdp, 8) == 0)
{
// check checksum rsdpd
bptr = (byte *)ptr;
for (i = 0; i < sizeof(struct RSDPtr); i++)
{
check += *bptr;
bptr++;
}
// found valid rsdpd
if (check == 0)
{
/*
if (desc->Revision == 0)
wrstr("acpi 1");
else
wrstr("acpi 2");
*/
return (unsigned int *)rsdp->RsdtAddress;
}
}
return NULL;
}
// finds the acpi header and returns the address of the rsdt
unsigned int *acpiGetRSDPtr(void)
{
unsigned int *addr;
unsigned int *rsdp;
// search below the 1mb mark for RSDP signature
for (addr = (unsigned int *)0x000E0000; (int)addr < 0x00100000; addr += 0x10 / sizeof(addr))
{
rsdp = acpiCheckRSDPtr(addr);
if (rsdp != NULL)
return rsdp;
}
// at address 0x40:0x0E is the RM segment of the ebda
int ebda = *((short *)0x40E); // get pointer
ebda = ebda * 0x10 & 0x000FFFFF; // transform segment into linear address
// search Extended BIOS Data Area for the Root System Description Pointer signature
for (addr = (unsigned int *)ebda; (int)addr < ebda + 1024; addr += 0x10 / sizeof(addr))
{
rsdp = acpiCheckRSDPtr(addr);
if (rsdp != NULL)
return rsdp;
}
return NULL;
}
// checks for a given header and validates checksum
int acpiCheckHeader(unsigned int *ptr, char *sig)
{
if (memcmp(ptr, sig, 4) == 0)
{
char *checkPtr = (char *)ptr;
int len = *(ptr + 1);
char check = 0;
while (0 < len--)
{
check += *checkPtr;
checkPtr++;
}
if (check == 0)
return 0;
}
return -1;
}
int acpiEnable(void)
{
// check if acpi is enabled
if ((inw((unsigned int)PM1a_CNT) & SCI_EN) == 0)
{
// check if acpi can be enabled
if (SMI_CMD != 0 && ACPI_ENABLE != 0)
{
outb((unsigned int)SMI_CMD, ACPI_ENABLE); // send acpi enable command
// give 3 seconds time to enable acpi
int i;
for (i = 0; i < 300; i++)
{
if ((inw((unsigned int)PM1a_CNT) & SCI_EN) == 1)
break;
sleep(10);
}
if (PM1b_CNT != 0)
for (; i < 300; i++)
{
if ((inw((unsigned int)PM1b_CNT) & SCI_EN) == 1)
break;
sleep(10);
}
if (i < 300)
{
wrstr("enabled acpi.\n");
return 0;
}
else
{
wrstr("couldn't enable acpi.\n");
return -1;
}
}
else
{
wrstr("no known way to enable acpi.\n");
return -1;
}
}
else
{
//wrstr("acpi was already enabled.\n");
return 0;
}
}
//
// bytecode of the \_S5 object
// -----------------------------------------
// | (optional) | | | |
// NameOP | \ | _ | S | 5 | _
// 08 | 5A | 5F | 53 | 35 | 5F
//
// -----------------------------------------------------------------------------------------------------------
// | | | ( SLP_TYPa ) | ( SLP_TYPb ) | ( Reserved ) | (Reserved )
// PackageOP | PkgLength | NumElements | byteprefix Num | byteprefix Num | byteprefix Num | byteprefix Num
// 12 | 0A | 04 | 0A 05 | 0A 05 | 0A 05 | 0A 05
//
//----this-structure-was-also-seen----------------------
// PackageOP | PkgLength | NumElements |
// 12 | 06 | 04 | 00 00 00 00
//
// (Pkglength bit 6-7 encode additional PkgLength bytes [shouldn't be the case here])
//
int initAcpi(void)
{
unsigned int *ptr = acpiGetRSDPtr();
// check if address is correct ( if acpi is available on this pc )
if (ptr != NULL && acpiCheckHeader(ptr, "RSDT") == 0)
{
// the RSDT contains an unknown number of pointers to acpi tables
int entrys = *(ptr + 1);
entrys = (entrys - 36) / 4;
ptr += 36 / 4; // skip header information
while (0 < entrys--)
{
// check if the desired table is reached
if (acpiCheckHeader((unsigned int *)*ptr, "FACP") == 0)
{
entrys = -2;
struct FACP *facp = (struct FACP *)*ptr;
if (acpiCheckHeader((unsigned int *)facp->DSDT, "DSDT") == 0)
{
// search the \_S5 package in the DSDT
char *S5Addr = (char *)facp->DSDT + 36; // skip header
int dsdtLength = *(facp->DSDT + 1) - 36;
while (0 < dsdtLength--)
{
if (memcmp(S5Addr, "_S5_", 4) == 0)
break;
S5Addr++;
}
// check if \_S5 was found
if (dsdtLength > 0)
{
// check for valid AML structure
if ((*(S5Addr - 1) == 0x08 || (*(S5Addr - 2) == 0x08 && *(S5Addr - 1) == '\\')) && *(S5Addr + 4) == 0x12)
{
S5Addr += 5;
// calculate PkgLength size
S5Addr += ((*S5Addr &0xC0)>>6) +2;
if (*S5Addr == 0x0A)
S5Addr++; // skip byteprefix
SLP_TYPa = *(S5Addr) << 10;
S5Addr++;
if (*S5Addr == 0x0A)
S5Addr++; // skip byteprefix
SLP_TYPb = *(S5Addr) << 10;
SMI_CMD = facp->SMI_CMD;
ACPI_ENABLE = facp->ACPI_ENABLE;
ACPI_DISABLE = facp->ACPI_DISABLE;
PM1a_CNT = facp->PM1a_CNT_BLK;
PM1b_CNT = facp->PM1b_CNT_BLK;
PM1_CNT_LEN = facp->PM1_CNT_LEN;
SLP_EN = 1 << 13;
SCI_EN = 1;
return 0;
}
else
{
wrstr("\\_S5 parse error.\n");
}
}
else
{
wrstr("\\_S5 not present.\n");
}
}
else
{
wrstr("DSDT invalid.\n");
}
}
ptr++;
}
wrstr("no valid FACP present.\n");
}
else
{
wrstr("no acpi.\n");
}
return -1;
}
void acpiPowerOff(void)
{
// SCI_EN is set to 1 if acpi shutdown is possible
if (SCI_EN == 0)
return;
acpiEnable();
// send the shutdown command
outw((unsigned int)PM1a_CNT, SLP_TYPa | SLP_EN);
if (PM1b_CNT != 0)
outw((unsigned int)PM1b_CNT, SLP_TYPb | SLP_EN);
wrstr("acpi poweroff failed.\n");
}
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