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acpi.c
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acpi.c
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/*****************************************************************************/
/* File: acpi.c */
/* */
/* Description: Source file for ACPI. */
/* */
/* Author: Shoily O Rahman <[email protected]> */
/* */
/* Date: Nov 3, 2020 */
/* */
/*****************************************************************************/
#include "acpi.h"
#include "debug.h"
#include "krnlconst.h"
#include "debug.h"
#include "type.h"
#include "util.h"
#include "system.h"
#include "interrupt.h"
#include "page32.h"
extern int ebda;
extern struct ioapic *ioapic;
typedef struct _RSD {
char signature[8];
u8 checksum;
char OEMID[6];
u8 revision;
u32 rsdt_address;
}__attribute__((packed)) RSD;
typedef struct _ACPI_TABLE {
char signature[4];
u32 length;
u8 revision;
u8 checksum;
char OEMID[6];
char OEM_table_id[8];
u32 OEM_revision;
u32 creator_id;
u32 creator_revision;
}__attribute__((packed)) ACPI_TABLE;
typedef struct _APIC_TABLE {
u8 type;
u8 length;
union {
struct {
u8 uid;
u8 apic_id;
u32 flags;
}__attribute__((packed)) processor_lapic;
struct {
u8 id;
u8 reserved;
u32 address;
u32 gsi_base;
}__attribute__((packed)) ioapic;
struct {
u8 bus;
u8 source;
u32 gsi;
union {
u16 flags;
struct {
u8 polarity:2;
u8 trigger:2;
u16 reserved:12;
}__attribute__((packed));
}__attribute__((packed));
}__attribute__((packed)) int_src_override;
struct {
u16 flags;
u32 gsi;
}__attribute__((packed)) nmi_source;
struct {
u8 uid;
u16 flags;
u8 lapic_lint;
}__attribute__((packed)) lapic_nmi;
}__attribute__((packed)) info;
}__attribute__((packed)) APIC_TABLE;
#define RSDPTR_STR "RSD PTR"
#define APIC_STR "APIC"
#define FACP_STR "FACP"
RSD *rsdp;
ACPI_TABLE *rsdt;
ACPI_TABLE **acpi_tables;
int num_acpi_tables;
extern bool keyboard_controller_8042_present;
bool acpi_find_rsdp() {
int phase = 0;
char *cur, *end;
cur = (char*)ADDPTRS(ebda, KERNEL_VIRT_ADDR);
end = (char*)ADDPTRS(ebda, 1024);
while(phase < 2) {
if (cur >= end) {
phase++;
if (phase == 1) {
cur = (char*)ADDPTRS(0xE0000, KERNEL_VIRT_ADDR);
end = (char*)ADDPTRS(cur, 0x20000);
}
}
if (!strncmp(((RSD*)cur)->signature, RSDPTR_STR, strlen(RSDPTR_STR))) {
rsdp = (RSD*)cur;
printf(KERNEL_INFO, "RSDP: %p\n", (long)rsdp-KERNEL_VIRT_ADDR);
return true;
}
cur++;
}
return false;
}
void acpi_process_madt(ACPI_TABLE *madt) {
int remaining_bytes;
APIC_TABLE *apic_table;
remaining_bytes = madt->length - 44;
apic_table = (APIC_TABLE*)ADDPTRS(madt, 44);
do {
remaining_bytes -= apic_table->length;
//printf(KERNEL_INFO, "Type: %d, L: %d ", (int)apic_table->type, (int)apic_table->length);
switch(apic_table->type) {
case 0:
{
//processor_lapic = (APIC_PROCESSOR_LAPIC*)header;
//printf(KERNEL_INFO, "UID: %d, APIC_ID: %d, Flags: %d", (int) processor_lapic->uid, (int) processor_lapic->apic_id, (int)processor_lapic->flags);
} break;
case 1:
{
printf(KERNEL_INFO, "IOAPIC_ID: %d, Addr: %x, GSIBase: %d ", (int)apic_table->info.ioapic.id, (int)apic_table->info.ioapic.address, (int)apic_table->info.ioapic.gsi_base);
ioapic_allocate(apic_table->info.ioapic.id,
(u32)apic_table->info.ioapic.address,
(int)apic_table->info.ioapic.gsi_base);
} break;
case 2:
{
//printf(KERNEL_INFO, "Bus: %d, Src: %d, GSI: %d, Flags: %x, p: %d, t: %d, r: %d ", (int)apic_table->info.int_src_override.bus, (int)apic_table->info.int_src_override.source, (int)apic_table->info.int_src_override.gsi, (int)apic_table->info.int_src_override.flags, (int)apic_table->info.int_src_override.polarity, (int)apic_table->info.int_src_override.trigger, (int)apic_table->info.int_src_override.reserved);
interrupt_set_override(apic_table->info.int_src_override.bus,
apic_table->info.int_src_override.source,
apic_table->info.int_src_override.gsi,
apic_table->info.int_src_override.polarity,
apic_table->info.int_src_override.trigger);
} break;
case 3:
{
printf(KERNEL_INFO, "Flags: %x GSI: %d ", (int)apic_table->info.nmi_source.flags, (int)apic_table->info.nmi_source.gsi);
} break;
case 4:
{
printf(KERNEL_INFO, "UID: %d, lint: %d, flags: %d ", (int)apic_table->info.lapic_nmi.uid, (int)apic_table->info.lapic_nmi.lapic_lint, (int)apic_table->info.lapic_nmi.flags);
} break;
}
apic_table = (APIC_TABLE*)ADDPTRS(apic_table, apic_table->length);
} while(remaining_bytes);
}
void acpi_process_table(ACPI_TABLE *acpi_table) {
char sig[5];
map_kernel_linear_with_pagetable((addr_t)acpi_table, acpi_table->length, PTE_PRESENT, false);
for(int i=0;i<4;i++)
sig[i] = acpi_table->signature[i];
sig[4] = 0;
printf(KERNEL_INFO, "ACPI Table: %p, %s, %d, %d ", acpi_table, sig, acpi_table->length, sizeof(ACPI_TABLE));
if (!strncmp(acpi_table->signature, APIC_STR, strlen(APIC_STR))) {
acpi_process_madt(acpi_table);
} else if (!strncmp(acpi_table->signature, FACP_STR, strlen(FACP_STR))) {
u16 iapc_boot_arch = *(u16*) ADDPTRS(acpi_table, 109);
printf(KERNEL_INFO, "iapc_boot_arch: %d\n",(int)iapc_boot_arch);
if (iapc_boot_arch & 2) {
keyboard_controller_8042_present = true;
printf(KERNEL_INFO, "8042 controller present\n");
}
}
}
void acpi_init() {
rsdp = NULL;
acpi_tables = NULL;
if (!acpi_find_rsdp()) {
printf(KERNEL_INFO, "No ACPI!!!\n");
return;
}
rsdt = (ACPI_TABLE*)ADDPTRS(rsdp->rsdt_address, KERNEL_VIRT_ADDR);
printf(KERNEL_INFO, "RSDT: %p %p ", (long)rsdt, (long)rsdp->rsdt_address);
map_kernel_linear_with_pagetable((addr_t)rsdt, sizeof(ACPI_TABLE), PTE_PRESENT, 0);
map_kernel_linear_with_pagetable((addr_t)rsdt, rsdt->length, PTE_PRESENT, 0);
printf(KERNEL_INFO, "RSDT: %p ", (long)rsdt-KERNEL_VIRT_ADDR);
printf(KERNEL_INFO, "RSDT Length: %d, %d ", rsdt->length, sizeof(ACPI_TABLE));
num_acpi_tables = (rsdt->length - sizeof(ACPI_TABLE)) / sizeof(void*);
acpi_tables = (ACPI_TABLE**)ADDPTRS(rsdt, sizeof(ACPI_TABLE));
for(int i=0;i<num_acpi_tables;i++) {
acpi_process_table((ACPI_TABLE*)ADDPTRS(acpi_tables[i], KERNEL_VIRT_ADDR));
}
printf(KERNEL_INFO, "\n");
}