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// Important specification: https://uefi.org/sites/default/files/resources/ACPI_6_2.pdf
// HPET: https://www.intel.com/content/dam/www/public/us/en/documents/technical-specifications/software-developers-hpet-spec-1-0a.pdf
#include <kernel/io/io.h>
#include <kernel/lib/lib.h>
#include <kernel/timer/timer.h>
#include <kernel/acpi/acpi.h>
#include <stddef.h>
#include <kernel/system.h>
struct FADT *fadt;
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;
unsigned int *acpi_check_rsd_ptr(unsigned int *ptr)
{
char *sig = "RSD PTR ";
struct RSD_ptr *rsdp = (struct RSD_ptr *) ptr;
char *bptr;
char check = 0;
unsigned int i;
if (memcmp(sig, rsdp, 8) == 0) {
bptr = (char *) ptr;
for (i = 0; i < sizeof(struct RSD_ptr); i++) {
check += *bptr;
bptr++;
}
if (check == 0) {
return (unsigned int *) rsdp->rsdt_address;
}
}
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_enable()
{
if ((inw((unsigned int) PM1a_CNT) & SCI_EN) == 0) {
if (SMI_CMD != 0 && ACPI_ENABLE != 0) {
outb((unsigned int) SMI_CMD, ACPI_ENABLE); // Enable ACPI
// Try 3s until ACPI is enabled
int i;
for (i = 0; i < 300; i++) {
if ((inw((unsigned int) PM1a_CNT) & SCI_EN) == 1)
break;
timer_wait(1);
}
if (PM1b_CNT != 0)
for (; i < 300; i++) {
if ((inw((unsigned int) PM1b_CNT) & SCI_EN) == 1)
break;
timer_wait(1);
}
if (i < 300) {
return 0; // Successfully enabled ACPI
} else {
serial_write("ACPI couldn't be enabled!\n");
return -1; // ACPI couldn't be enabled
}
} else {
serial_write("ACPI is not supported!\n");
return -1; // ACPI is not supported
}
} else {
serial_write("ACPI was already enabled!\n");
return 0; // ACPI was already enabled
}
}
int acpi_install()
{
unsigned int *ptr = acpi_get_rsd_ptr();
int success = 0;
if (ptr != NULL && memcmp(ptr, "RSDT", 4) == 0) {
int entries = *(ptr + 1);
entries = (entries - 36) / 4;
ptr += 36 / 4;
while (0 < entries--) {
if (memcmp((unsigned int *) *ptr, "FACP", 4) == 0) {
fadt = (struct FADT *) *ptr; // TODO: Allocate ACPI tables after paging (page fault)!
if (memcmp((unsigned int *) fadt->DSDT, "DSDT", 4) == 0) {
char *S5Addr = (char *) fadt->DSDT + 36;
int dsdt_length = *(fadt->DSDT + 1) - 36;
while (0 < dsdt_length--) {
if (memcmp(S5Addr, "_S5_", 4) == 0)
break;
S5Addr++;
}
if (dsdt_length > 0) {
// TODO: Implement device detection via DSDT ACPI (p199 -> AML)
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 = fadt->SMI_CMD;
ACPI_ENABLE = fadt->ACPI_ENABLE;
ACPI_DISABLE = fadt->ACPI_DISABLE;
PM1a_CNT = fadt->PM1a_CNT_BLK;
PM1b_CNT = fadt->PM1b_CNT_BLK;
PM1_CNT_LEN = fadt->PM1_CNT_LEN;
SLP_EN = 1 << 13;
SCI_EN = 1;
acpi_enable();
vga_log("Installed ACPI", 3);
success = 1;
} // Else: \_S5 parse error
} // Else: \_S5 not present
} // Else: DSDT invalid
}
if (memcmp((unsigned int *) *ptr, "HPET", 4) == 0) {
hpet = (struct HPET *) *ptr;
// serial_write(hpet->signature);
// serial_write_hex((int) hpet->base_address);
}
ptr++;
} // Else: no valid FADT present
} else {
serial_write("ACPI is not supported!\n");
}
return success == 1 ? 0 : -1;
}
void acpi_poweroff()
{
asm ("cli");
if (SCI_EN == 0) {
warn("ACPI shutdown is not supported\n");
return;
}
// Send shutdown command
outw((unsigned int) PM1a_CNT, SLP_TYPa | SLP_EN);
if (PM1b_CNT != 0)
outw((unsigned int) PM1b_CNT, SLP_TYPb | SLP_EN);
else {
outw(0xB004, 0x2000); // Bochs
outw(0x604, 0x2000); // QEMU
outw(0x4004, 0x3400); // VirtualBox
}
}
void reboot()
{
asm ("cli");
uint8_t good = 0x02;
while (good & 0x02)
good = inb(0x64);
outb(0x64, 0xFE);
halt_loop();
}
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