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f0025dbc47
Now that the other CPUs have been brought up, add support for scheduling tasks on them. The scheduler now maintains separate ready/blocked lists per CPU, and CPUs will attempt to balance load via periodic work stealing. Other changes as a result of this: - The device manager no longer creates a local APIC object, but instead just gathers relevant info from the APCI tables. Each CPU creates its own local APIC object. This also spurred the APIC timer calibration to become a static value, as all APICs are assumed to be symmetrical. - Fixed a bug where the scheduler was popping the current task off of its ready list, however the current task is never on the ready list (except the idle task was first set up as both current and ready). This was causing the lists to get into bad states. Now a task can only ever be current or in a ready or blocked list. - Got rid of the unused static process::s_processes list of all processes, instead of trying to synchronize it via locks. - Added spinlocks for synchronization to the scheduler and logger objects.
67 lines
1.6 KiB
C++
67 lines
1.6 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 "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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// 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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