2d4a65c654
In order to avoid cyclic dependencies in the case of page faults while bringing up an AP, pre-allocate the cpu_data structure and related CPU control structures, and pass them to the AP startup code. This also changes the following: - cpu_early_init() was split out of cpu_early_init() to allow early usage of current_cpu() on the BSP before we're ready for the rest of cpu_init(). (These functions were also renamed to follow the preferred area_action naming style.) - isr_handler now zeroes out the IST entry for its vector instead of trying to increment the IST stack pointer - the IST stacks are allocated outside of cpu_init, to also help reduce stack pressue and chance of page faults before APs are ready - share stack areas between AP idle threads so we only waste 1K per additional AP for the unused idle stack
71 lines
1.7 KiB
C++
71 lines
1.7 KiB
C++
#include <stdint.h>
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#include "kutil/assert.h"
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#include "kutil/memory.h"
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#include "apic.h"
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#include "cpu.h"
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#include "cpu/cpu_id.h"
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#include "device_manager.h"
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#include "gdt.h"
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#include "idt.h"
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#include "kernel_memory.h"
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#include "log.h"
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#include "msr.h"
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#include "objects/vm_area.h"
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#include "syscall.h"
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#include "tss.h"
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cpu_data g_bsp_cpu_data;
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void
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cpu_validate()
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{
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cpu::cpu_id cpu;
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log::info(logs::boot, "CPU: %s", cpu.brand_name());
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log::debug(logs::boot, " Vendor is %s", cpu.vendor_id());
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log::debug(logs::boot, " Higest basic CPUID: 0x%02x", cpu.highest_basic());
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log::debug(logs::boot, " Higest ext CPUID: 0x%02x", cpu.highest_ext() & ~cpu::cpu_id::cpuid_extended);
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#define CPU_FEATURE_OPT(name, ...) \
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log::debug(logs::boot, " Supports %9s: %s", #name, cpu.has_feature(cpu::feature::name) ? "yes" : "no");
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#define CPU_FEATURE_REQ(name, feat_leaf, feat_sub, regname, bit) \
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CPU_FEATURE_OPT(name, feat_leaf, feat_sub, regname, bit); \
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kassert(cpu.has_feature(cpu::feature::name), "Missing required CPU feature " #name );
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#include "cpu/features.inc"
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#undef CPU_FEATURE_OPT
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#undef CPU_FEATURE_REQ
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}
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void
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cpu_early_init(cpu_data *cpu)
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{
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IDT::get().install();
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cpu->gdt->install();
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// Install the GS base pointint to the cpu_data
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wrmsr(msr::ia32_gs_base, reinterpret_cast<uintptr_t>(cpu));
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}
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void
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cpu_init(cpu_data *cpu, bool bsp)
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{
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if (!bsp) {
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// The BSP already called cpu_early_init
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cpu_early_init(cpu);
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}
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lapic &apic = device_manager::get().get_lapic();
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cpu->id = apic.get_id();
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// Set up the syscall MSRs
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syscall_enable();
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// Set up the page attributes table
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uint64_t pat = rdmsr(msr::ia32_pat);
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pat = (pat & 0x00ffffffffffffffull) | (0x01ull << 56); // set PAT 7 to WC
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wrmsr(msr::ia32_pat, pat);
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}
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