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3b3857548c
The new CPU_FEATURE_WRN macro in the cpu features list will cause the kernel to emit a warning but not panic if the feature is missing.
103 lines
2.5 KiB
C++
103 lines
2.5 KiB
C++
#include <cpu/cpu_id.h>
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#include "console.h"
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#include "error.h"
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#include "hardware.h"
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#include "status.h"
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namespace boot {
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namespace hw {
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void *
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find_acpi_table(uefi::system_table *st)
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{
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status_line status(L"Searching for ACPI table");
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// Find ACPI tables. Ignore ACPI 1.0 if a 2.0 table is found.
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uintptr_t acpi1_table = 0;
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for (size_t i = 0; i < st->number_of_table_entries; ++i) {
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uefi::configuration_table *table = &st->configuration_table[i];
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// If we find an ACPI 2.0 table, return it immediately
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if (table->vendor_guid == uefi::vendor_guids::acpi2)
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return table->vendor_table;
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if (table->vendor_guid == uefi::vendor_guids::acpi1) {
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// Mark a v1 table with the LSB high
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acpi1_table = reinterpret_cast<uintptr_t>(table->vendor_table);
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acpi1_table |= 1;
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}
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}
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if (!acpi1_table) {
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error::raise(uefi::status::not_found, L"Could not find ACPI table");
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} else if (acpi1_table & 1) {
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status_line::warn(L"Only found ACPI 1.0 table");
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}
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return reinterpret_cast<void*>(acpi1_table);
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}
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static uint64_t
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rdmsr(uint32_t addr)
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{
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uint32_t low, high;
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__asm__ __volatile__ ("rdmsr" : "=a"(low), "=d"(high) : "c"(addr));
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return (static_cast<uint64_t>(high) << 32) | low;
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}
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static void
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wrmsr(uint32_t addr, uint64_t value)
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{
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uint32_t low = value & 0xffffffff;
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uint32_t high = value >> 32;
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__asm__ __volatile__ ("wrmsr" :: "c"(addr), "a"(low), "d"(high));
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}
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void
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setup_control_regs()
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{
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uint64_t cr4 = 0;
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asm volatile ( "mov %%cr4, %0" : "=r" (cr4) );
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cr4 |= 0x000080; // Enable global pages
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asm volatile ( "mov %0, %%cr4" :: "r" (cr4) );
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// Set up IA32_EFER
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constexpr uint32_t IA32_EFER = 0xC0000080;
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uint64_t efer = rdmsr(IA32_EFER);
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efer |=
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0x0001 | // Enable SYSCALL
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0x0800 | // Enable NX bit
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0;
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wrmsr(IA32_EFER, efer);
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}
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void
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check_cpu_supported()
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{
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status_line status {L"Checking CPU features"};
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cpu::cpu_id cpu;
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cpu::features features = cpu.features();
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bool supported = true;
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#define CPU_FEATURE_OPT(...)
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#define CPU_FEATURE_WRN(...)
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#define CPU_FEATURE_REQ(name, ...) \
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if (!features[cpu::feature::name]) { \
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status::fail(L"CPU required feature " L ## #name, uefi::status::unsupported); \
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supported = false; \
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}
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#include "cpu/features.inc"
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#undef CPU_FEATURE_REQ
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#undef CPU_FEATURE_OPT
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if (!supported)
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error::raise(uefi::status::unsupported, L"CPU not supported");
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}
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} // namespace hw
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} // namespace boot
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