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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,4 +1,5 @@ | ||
| *.o | ||
| *.a | ||
| *.bin | ||
| *.iso | ||
| *.elf | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,83 @@ | ||
| #include "include/acpi.h" | ||
| #include "libc/include/string.h" | ||
| #include "libc/include/stdio.h" | ||
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| static acpi_rsdp_t *rsdp = NULL; | ||
| static acpi_xsdt_t *xsdt = NULL; | ||
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| static bool validate_table(acpi_sdt_header_t *table_header) { | ||
| u8 sum = 0; | ||
| for (u32 i = 0; i < table_header->length; i++) { | ||
| sum += ((u8 *) table_header)[i]; | ||
| } | ||
| return sum == 0; | ||
| } | ||
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| bool acpi_init(void) { | ||
| // Search for the RSDP | ||
| for (u8 *addr = (u8 *)0x000E0000; addr < (u8 *)0x00100000; addr += 16) { | ||
| if (memcmp(addr, "RSD PTR ", 8) == 0) { | ||
| rsdp = (acpi_rsdp_t *)addr; | ||
| break; | ||
| } | ||
| } | ||
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| if (!rsdp) { | ||
| printf("ACPI: RSDP not found\n"); | ||
| return false; | ||
| } | ||
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| // Validate RSDP checksum | ||
| u8 sum = 0; | ||
| for (int i = 0; i < sizeof(acpi_rsdp_t); i++) { | ||
| sum += ((u8 *)rsdp)[i]; | ||
| } | ||
| if (sum != 0) { | ||
| printf("ACPI: RSDP checksum invalid\n"); | ||
| return false; | ||
| } | ||
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| // Get XSDT | ||
| xsdt = (acpi_xsdt_t *)(u32)rsdp->rsdt_address; | ||
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| if (!validate_table(&xsdt->header)) { | ||
| printf("ACPI: XSDT checksum invalid\n"); | ||
| return false; | ||
| } | ||
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| printf("ACPI: Initialization successful\n"); | ||
| return true; | ||
| } | ||
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| void *acpi_find_table(const char *signature) { | ||
| u32 entries = (xsdt->header.length - sizeof(acpi_sdt_header_t)) / sizeof(u64); | ||
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| for (u32 i = 0; i < entries; i++) { | ||
| acpi_sdt_header_t *header = (acpi_sdt_header_t *)(u32)xsdt->entry[i]; | ||
| if (memcmp(header->signature, signature, 4) == 0) { | ||
| if (validate_table(header)) { | ||
| return header; | ||
| } else { | ||
| printf("ACPI: Found table %.4s but checksum invalid\n", signature); | ||
| return NULL; | ||
| } | ||
| } | ||
| } | ||
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| printf("ACPI: Table %.4s not found\n", signature); | ||
| return NULL; | ||
| } | ||
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| void probe_acpi(void) { | ||
| printf("ACPI: Probing tables\n"); | ||
| printf("ACPI: RSDP found at 0x%x\n", (u32)rsdp); | ||
| printf("ACPI: XSDT found at 0x%x\n", (u32)xsdt); | ||
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| u32 entries = (xsdt->header.length - sizeof(acpi_sdt_header_t)) / sizeof(u64); | ||
| printf("ACPI: XSDT contains %d entries\n", entries); | ||
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| for (u32 i = 0; i < entries; i++) { | ||
| acpi_sdt_header_t *header = (acpi_sdt_header_t *)(u32)xsdt->entry[i]; | ||
| printf("ACPI: Found table %.4s at 0x%x\n", header->signature, (u32)header); | ||
| } | ||
| } |
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