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#include <kernel/io/io.h>
#include <kernel/lib/lib.h>
#include <kernel/timer/timer.h>
#include <stddef.h>
uint32_t *SMI_CMD;
char ACPI_ENABLE;
char ACPI_DISABLE;
uint32_t *PM1a_CNT;
uint32_t *PM1b_CNT;
int SLP_TYPa;
int SLP_TYPb;
int SLP_EN;
int SCI_EN;
char PM1_CNT_LEN;
struct RSDPtr {
char Signature[8];
char CheckSum;
char OemID[6];
char Revision;
uint32_t *RsdtAddress;
};
struct FACP {
char Signature[4];
uint32_t Length;
char unneded1[40 - 8];
uint32_t *DSDT;
char unneded2[48 - 44];
uint32_t *SMI_CMD;
char ACPI_ENABLE;
char ACPI_DISABLE;
char unneded3[64 - 54];
uint32_t *PM1a_CNT_BLK;
uint32_t *PM1b_CNT_BLK;
char unneded4[89 - 72];
char PM1_CNT_LEN;
};
unsigned int *acpi_check_rsd_ptr(unsigned int *ptr) {
char *sig = "RSD PTR ";
struct RSDPtr *rsdp = (struct RSDPtr *) ptr;
char *bptr;
char check = 0;
unsigned int i;
if (memory_compare(sig, rsdp, 8) == 0) {
bptr = (char *) ptr;
for (i = 0; i < sizeof(struct RSDPtr); i++) {
check += *bptr;
bptr++;
}
if (check == 0) {
return (unsigned int *) rsdp->RsdtAddress;
}
}
return NULL;
}
unsigned int *acpi_get_rsd_ptr() {
unsigned int *addr;
unsigned int *rsdp;
for (addr = (unsigned int *) 0x000E0000; (int) addr < 0x00100000; addr += 0x10 / sizeof(addr)) {
rsdp = acpi_check_rsd_ptr(addr);
if (rsdp != NULL)
return rsdp;
}
int ebda = *((short *) 0x40E);
ebda = ebda * 0x10 & 0x000FFFFF;
for (addr = (unsigned int *) ebda; (int) addr < ebda + 1024; addr += 0x10 / sizeof(addr)) {
rsdp = acpi_check_rsd_ptr(addr);
if (rsdp != NULL)
return rsdp;
}
return NULL;
}
int acpi_check_header(unsigned int *ptr, char *sig) {
if (memory_compare(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 acpi_enable() {
if ((receive_w((unsigned int) PM1a_CNT) & SCI_EN) == 0) {
if (SMI_CMD != 0 && ACPI_ENABLE != 0) {
send_b((unsigned int) SMI_CMD, ACPI_ENABLE); // Enable ACPI
// Try 3s until ACPI is enabled
int i;
for (i = 0; i < 300; i++) {
if ((receive_w((unsigned int) PM1a_CNT) & SCI_EN) == 1)
break;
timer_wait(1);
}
if (PM1b_CNT != 0)
for (; i < 300; i++) {
if ((receive_w((unsigned int) PM1b_CNT) & SCI_EN) == 1)
break;
timer_wait(1);
}
if (i < 300) {
return 0; // Successfully enabled ACPI
} else {
return -1; // ACPI couldn't be enabled
}
} else {
return -1; // ACPI is not supported
}
} else {
return 0; // ACPI was already enabled
}
}
int acpi_install() {
unsigned int *ptr = acpi_get_rsd_ptr();
if (ptr != NULL && acpi_check_header(ptr, "RSDT") == 0) {
int entrys = *(ptr + 1);
entrys = (entrys - 36) / 4;
ptr += 36 / 4;
while (0 < entrys--) {
if (acpi_check_header((unsigned int *) *ptr, "FACP") == 0) {
entrys = -2;
struct FACP *facp = (struct FACP *) *ptr;
if (acpi_check_header((unsigned int *) facp->DSDT, "DSDT") == 0) {
char *S5Addr = (char *) facp->DSDT + 36;
int dsdtLength = *(facp->DSDT + 1) - 36;
while (0 < dsdtLength--) {
if (memory_compare(S5Addr, "_S5_", 4) == 0)
break;
S5Addr++;
}
if (dsdtLength > 0) {
if ((*(S5Addr - 1) == 0x08 || (*(S5Addr - 2) == 0x08 && *(S5Addr - 1) == '\\')) &&
*(S5Addr + 4) == 0x12) {
S5Addr += 5;
S5Addr += ((*S5Addr & 0xC0) >> 6) + 2;
if (*S5Addr == 0x0A)
S5Addr++;
SLP_TYPa = *(S5Addr) << 10;
S5Addr++;
if (*S5Addr == 0x0A)
S5Addr++;
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: \_S5 parse error
} // Else: \_S5 not present
} // Else: DSDT invalid
}
ptr++;
} // Else: no valid FACP present
} // Else: No ACPI available
return -1;
}
void acpi_poweroff() {
acpi_install();
acpi_enable();
if (SCI_EN == 0) {
serial_write("ACPI shutdown is not supported\n");
return;
}
// Send shutdown command
send_w((unsigned int) PM1a_CNT, SLP_TYPa | SLP_EN);
if (PM1b_CNT != 0)
send_w((unsigned int) PM1b_CNT, SLP_TYPb | SLP_EN);
else {
send_w(0xB004, 0x2000); // Bochs
send_w(0x604, 0x2000); // QEMU
send_w(0x4004, 0x3400); // VirtualBox
}
serial_write("Shutdown failed\n");
}
void reboot() {
asm volatile ("cli");
uint8_t good = 0x02;
while (good & 0x02)
good = receive_b(0x64);
send_b(0x64, 0xFE);
loop:
asm volatile ("hlt");
goto loop;
}
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