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feat/kernel: Added MADT header for kernel

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This commit is contained in:
Kevin Alavik 2025-05-16 19:17:10 +02:00
parent 91cc3ef58f
commit 71630b9fb0
Signed by: cmpsb
GPG key ID: 10D1CC0526FDC6D7
3 changed files with 117 additions and 2 deletions
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14
kernel/src/arch/cpu.h
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@ -17,4 +17,18 @@ static inline noreturn void hcf()
__asm__ volatile("hlt");
}
static inline void wrmsr(uint64_t msr, uint64_t value)
{
uint32_t low = value & 0xFFFFFFFF;
uint32_t high = value >> 32;
asm volatile("wrmsr" : : "c"(msr), "a"(low), "d"(high));
}
static inline uint64_t rdmsr(uint64_t msr)
{
uint32_t low, high;
asm volatile("rdmsr" : "=a"(low), "=d"(high) : "c"(msr));
return ((uint64_t)high << 32) | low;
}
#endif // CPU_H

2
kernel/src/sys/acpi.c
View file

@ -21,8 +21,6 @@ void acpi_init(void)
if (memcmp(rsdp->signature, "RSD PTR", 7) != 0)
kpanic(NULL, "Invalid RSDP signature!");
log_early("RSDP Signature: %.*s", 7, rsdp->signature);
if (rsdp->revision != 0)
{
acpi_uses_xsdt = 1;

103
kernel/src/sys/acpi/madt.h Normal file
View file

@ -0,0 +1,103 @@
/* EMK 1.0 Copyright (c) 2025 Piraterna */
#ifndef MADT_H
#define MADT_H
#include <stdint.h>
#include <sys/acpi.h>
#define MADT_ENTRY_LAPIC 0 /* Local APIC */
#define MADT_ENTRY_IOAPIC 1 /* I/O APIC */
#define MADT_ENTRY_IOAPIC_SRC_OVR 2 /* I/O APIC Interrupt Source Override */
#define MADT_ENTRY_IOAPIC_NMI_SRC 3 /* I/O APIC Non-Maskable Interrupt Source */
#define MADT_ENTRY_LAPIC_NMI 4 /* Local APIC Non-Maskable Interrupt */
#define MADT_ENTRY_LAPIC_ADDR_OVR 5 /* Local APIC Address Override */
#define MADT_ENTRY_LX2APIC 9 /* Local x2APIC */
typedef struct acpi_madt
{
acpi_sdt_header_t sdt;
uint32_t lapic_base;
uint32_t flags;
char table[];
} __attribute__((packed)) acpi_madt_t;
typedef struct acpi_madt_entry
{
uint8_t type;
uint8_t length;
} __attribute__((packed)) acpi_madt_entry_t;
/* Entry Type 0: Processor Local APIC */
typedef struct acpi_madt_lapic
{
uint8_t type; /* 0 */
uint8_t length;
uint8_t acpi_proc_id; /* ACPI Processor ID */
uint8_t apic_id; /* APIC ID */
uint32_t flags; /* Bit 0: Processor Enabled, Bit 1: Online Capable */
} __attribute__((packed)) acpi_madt_lapic_t;
/* Entry Type 1: I/O APIC */
typedef struct acpi_madt_ioapic
{
uint8_t type;
uint8_t length;
uint8_t ioapic_id; /* I/O APIC's ID */
uint8_t reserved; /* Reserved (0) */
uint32_t ioapic_addr; /* I/O APIC Address */
uint32_t gsi_base; /* Global System Interrupt Base */
} __attribute__((packed)) acpi_madt_ioapic_t;
/* Entry Type 2: I/O APIC Interrupt Source Override */
typedef struct acpi_madt_ioapic_src_ovr
{
uint8_t type;
uint8_t length;
uint8_t bus_source; /* Bus Source */
uint8_t irq_source; /* IRQ Source */
uint32_t gsi; /* Global System Interrupt */
uint16_t flags; /* Flags */
} __attribute__((packed)) acpi_madt_ioapic_src_ovr_t;
/* Entry Type 3: I/O APIC Non-Maskable Interrupt Source */
typedef struct acpi_madt_ioapic_nmi_src
{
uint8_t type;
uint8_t length;
uint8_t nmi_source; /* NMI Source */
uint8_t reserved; /* Reserved */
uint16_t flags; /* Flags */
uint32_t gsi; /* Global System Interrupt */
} __attribute__((packed)) acpi_madt_ioapic_nmi_src_t;
/* Entry Type 4: Local APIC Non-Maskable Interrupt */
typedef struct acpi_madt_lapic_nmi
{
uint8_t type;
uint8_t length;
uint8_t acpi_proc_id; /* ACPI Processor ID (0xFF for all processors) */
uint16_t flags; /* Flags */
uint8_t lint; /* LINT# (0 or 1) */
} __attribute__((packed)) acpi_madt_lapic_nmi_t;
/* Entry Type 5: Local APIC Address Override */
typedef struct acpi_madt_lapic_addr_ovr
{
uint8_t type;
uint8_t length;
uint16_t reserved; /* Reserved */
uint64_t lapic_addr; /* 64-bit Physical Address of Local APIC */
} __attribute__((packed)) acpi_madt_lapic_addr_ovr_t;
/* Entry Type 9: Processor Local x2APIC */
typedef struct acpi_madt_lx2apic
{
uint8_t type;
uint8_t length;
uint16_t reserved;
uint32_t x2apic_id; /* Processor's Local x2APIC ID */
uint32_t flags; /* Flags (same as Local APIC) */
uint32_t acpi_id; /* ACPI ID */
} __attribute__((packed)) acpi_madt_lx2apic_t;
#endif // MADT_H