justin/jsix
1
1
Fork 0
mirror of https://github.com/justinian/jsix.git synced 2025-12-10 00:14:32 -08:00
Code Issues Packages Projects Releases Wiki Activity

[cpu] Split cpuid validation into separate lib

Browse Source 
In order to allow the bootloader to do preliminary CPUID validation
while UEFI is still handling displaying information to the user, split
most of the kernel's CPUID handling into a library to be used by both
kernel and boot.
This commit is contained in:
Justin C. Miller
2021-01-18 13:26:45 -08:00
parent 55a5c97034
commit c3a0266354
8 changed files with 229 additions and 165 deletions
Download Patch File Download Diff File Expand all files Collapse all files

109
src/kernel/cpu.cpp
View File

@@ -1,116 +1,31 @@
#include <stdint.h>
#include "kutil/assert.h"
#include "kutil/memory.h"
#include "cpu.h"
#include "cpu/cpu.h"
#include "log.h"
cpu_data bsp_cpu_data;
static constexpr uint32_t cpuid_extended = 0x80000000;
inline static void
__cpuid(
uint32_t leaf,
uint32_t subleaf,
uint32_t *eax,
uint32_t *ebx = nullptr,
uint32_t *ecx = nullptr,
uint32_t *edx = nullptr)
{
uint32_t a, b, c, d;
__asm__ __volatile__ ( "cpuid"
: "=a"(a), "=b"(b), "=c"(c), "=d"(d)
: "a"(leaf), "c"(subleaf)
);
if (eax) *eax = a;
if (ebx) *ebx = b;
if (ecx) *ecx = c;
if (edx) *edx = d;
}
cpu_id::cpu_id() :
m_features(0)
{
__cpuid(0, 0,
&m_high_basic,
reinterpret_cast<uint32_t *>(&m_vendor_id[0]),
reinterpret_cast<uint32_t *>(&m_vendor_id[8]),
reinterpret_cast<uint32_t *>(&m_vendor_id[4]));
__cpuid(cpuid_extended, 0, &m_high_ext);
if (m_high_ext >= cpuid_extended + 4) {
__cpuid(cpuid_extended + 2, 0,
reinterpret_cast<uint32_t *>(&m_brand_name[0]),
reinterpret_cast<uint32_t *>(&m_brand_name[4]),
reinterpret_cast<uint32_t *>(&m_brand_name[8]),
reinterpret_cast<uint32_t *>(&m_brand_name[12]));
__cpuid(cpuid_extended + 3, 0,
reinterpret_cast<uint32_t *>(&m_brand_name[16]),
reinterpret_cast<uint32_t *>(&m_brand_name[20]),
reinterpret_cast<uint32_t *>(&m_brand_name[24]),
reinterpret_cast<uint32_t *>(&m_brand_name[28]));
__cpuid(cpuid_extended + 4, 0,
reinterpret_cast<uint32_t *>(&m_brand_name[32]),
reinterpret_cast<uint32_t *>(&m_brand_name[36]),
reinterpret_cast<uint32_t *>(&m_brand_name[40]),
reinterpret_cast<uint32_t *>(&m_brand_name[44]));
} else {
m_brand_name[0] = 0;
}
}
cpu_id::regs
cpu_id::get(uint32_t leaf, uint32_t sub) const
{
regs ret {0, 0, 0, 0};
if ((leaf & cpuid_extended) == 0 && leaf > m_high_basic) return ret;
if ((leaf & cpuid_extended) != 0 && leaf > m_high_ext) return ret;
__cpuid(leaf, sub, &ret.eax, &ret.ebx, &ret.ecx, &ret.edx);
return ret;
}
void
cpu_id::validate()
cpu_validate()
{
bool fail = false;
uint32_t leaf = 0;
uint32_t sub = 0;
regs r;
cpu::cpu_id cpu;
log::info(logs::boot, "CPU: %s", brand_name());
log::debug(logs::boot, " Vendor is %s", vendor_id());
log::info(logs::boot, "CPU: %s", cpu.brand_name());
log::debug(logs::boot, " Vendor is %s", cpu.vendor_id());
log::debug(logs::boot, " Higest basic CPUID: 0x%02x", highest_basic());
log::debug(logs::boot, " Higest ext CPUID: 0x%02x", highest_ext() & ~cpuid_extended);
log::debug(logs::boot, " Higest basic CPUID: 0x%02x", cpu.highest_basic());
log::debug(logs::boot, " Higest ext CPUID: 0x%02x", cpu.highest_ext() & ~cpu::cpu_id::cpuid_extended);
#define CPU_FEATURE_OPT(name, feat_leaf, feat_sub, regname, bit) \
if (leaf != feat_leaf || sub != feat_sub) { \
leaf = feat_leaf; sub = feat_sub; r = get(leaf, sub); \
} \
if (r.regname & (1ull << bit)) \
m_features |= (1ull << static_cast<uint64_t>(cpu_feature::name)); \
log::debug(logs::boot, " Supports %9s: %s", #name, (r.regname & (1ull << bit)) ? "yes" : "no");
#define CPU_FEATURE_OPT(name, ...) \
log::debug(logs::boot, " Supports %9s: %s", #name, cpu.has_feature(cpu::feature::name) ? "yes" : "no");
#define CPU_FEATURE_REQ(name, feat_leaf, feat_sub, regname, bit) \
CPU_FEATURE_OPT(name, feat_leaf, feat_sub, regname, bit); \
if ((r.regname & (1ull << bit)) == 0) { \
log::error(logs::boot, "CPU missing required feature " #name); \
fail = true; \
}
kassert(cpu.has_feature(cpu::feature::name), "Missing required CPU feature " #name );
#include "cpu_features.inc"
#include "cpu/features.inc"
#undef CPU_FEATURE_OPT
#undef CPU_FEATURE_REQ
if (fail)
log::fatal(logs::boot, "CPU not supported.");
}
bool
cpu_id::has_feature(cpu_feature feat)
{
return (m_features & (1 << static_cast<uint64_t>(feat))) != 0;
}