62 lines
1.6 KiB
C
62 lines
1.6 KiB
C
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#include "Tier0/acpi.h"
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#include "Tier0/kstdio.h"
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u8 g_acpi_version = 0;
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u32 g_acpi_rsdt_address = 0;
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u64 acpi_find_rsdp(void)
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{
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s8 *szMagic = "RSD PTR ";
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// Try to find the pointer... apparently it's 16byte-aligned...
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u64 Address = 0;
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for (u64 Search = 0x000E0000; Search <= 0x000FFFFF; Search += 4)
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{
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if (kmemcmp((u8 *)Search, (u8 *)szMagic, 8) == 0)
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{
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u8 ChecksumVerify = 0;
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for (u8 i = 0; i < ACPI_10_RSDP_SIZE; i++)
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ChecksumVerify += ((u8*)Search)[i];
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if (ChecksumVerify == 0)
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{
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if (((T_ACPI_RSDP *)Search)->Revision == 1)
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{
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ChecksumVerify = 0;
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for (u8 i = ACPI_10_RSDP_SIZE; i < ACPI_20_RSDP_SIZE; i++)
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ChecksumVerify += ((u8*)Search)[i];
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if (ChecksumVerify == 0)
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{
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Address = Search;
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break;
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}
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}
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else
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{
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Address = Search;
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break;
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}
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}
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}
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}
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if (Address == 0)
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return 0;
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T_ACPI_RSDP *RSDP = (T_ACPI_RSDP *)Address;
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g_acpi_version = RSDP->Revision + 1;
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kprintf("[i] Detected ACPI version %i.0.\n", RSDP->Revision + 1);
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if (*RSDP->OEMID != 0)
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kprintf("[i] OEMID %s.\n", RSDP->OEMID);
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if (g_acpi_version == ACPI_VERSION_10)
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g_acpi_rsdt_address = Address;
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else
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g_acpi_rsdt_address = RSDP->RSDTAddressExLow;
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return Address;
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}
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