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Add a simple /proc/cpuinfo that includes some info from CPUID.

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This commit is contained in:
Andreas Kling 2018-11-02 09:25:23 +01:00
parent 90ddbca127
commit 812e7940e2
Notes: sideshowbarker 2024-07-19 18:34:34 +09:00
5 changed files with 81 additions and 3 deletions
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67
Kernel/ProcFileSystem.cpp
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@ -4,6 +4,7 @@
#include "system.h"
#include "MemoryManager.h"
#include "StdLib.h"
#include "i386.h"
static ProcFileSystem* s_the;
@ -177,6 +178,71 @@ ByteBuffer procfs$mounts()
return buffer;
}
ByteBuffer procfs$cpuinfo()
{
auto buffer = ByteBuffer::createUninitialized(256);
char* ptr = (char*)buffer.pointer();
{
CPUID cpuid(0);
ptr += ksprintf(ptr, "cpuid: ");
auto emit_dword = [&] (dword value) {
ptr += ksprintf(ptr, "%c%c%c%c",
value & 0xff,
(value >> 8) & 0xff,
(value >> 16) & 0xff,
(value >> 24) & 0xff);
};
emit_dword(cpuid.ebx());
emit_dword(cpuid.edx());
emit_dword(cpuid.ecx());
ptr += ksprintf(ptr, "\n");
}
{
CPUID cpuid(1);
dword stepping = cpuid.eax() & 0xf;
dword model = (cpuid.eax() >> 4) & 0xf;
dword family = (cpuid.eax() >> 8) & 0xf;
dword type = (cpuid.eax() >> 12) & 0x3;
dword extended_model = (cpuid.eax() >> 16) & 0xf;
dword extended_family = (cpuid.eax() >> 20) & 0xff;
dword display_model;
dword display_family;
if (family == 15) {
display_family = family + extended_family;
display_model = model + (extended_model << 4);
} else if (family == 6) {
display_family = family;
display_model = model + (extended_model << 4);
} else {
display_family = family;
display_model = model;
}
ptr += ksprintf(ptr, "family: %u\n", display_family);
ptr += ksprintf(ptr, "model: %u\n", display_model);
ptr += ksprintf(ptr, "stepping: %u\n", stepping);
ptr += ksprintf(ptr, "type: %u\n", type);
}
{
// FIXME: Check first that this is supported by calling CPUID with eax=0x80000000
// and verifying that the returned eax>=0x80000004.
char buffer[48];
dword* bufptr = reinterpret_cast<dword*>(buffer);
auto copy_brand_string_part_to_buffer = [&] (dword i) {
CPUID cpuid(0x80000002 + i);
*bufptr++ = cpuid.eax();
*bufptr++ = cpuid.ebx();
*bufptr++ = cpuid.ecx();
*bufptr++ = cpuid.edx();
};
copy_brand_string_part_to_buffer(0);
copy_brand_string_part_to_buffer(1);
copy_brand_string_part_to_buffer(2);
ptr += ksprintf(ptr, "brandstr: \"%s\"\n", buffer);
}
buffer.trim(ptr - (char*)buffer.pointer());
return buffer;
}
ByteBuffer procfs$kmalloc()
{
InterruptDisabler disabler;
@ -235,6 +301,7 @@ bool ProcFileSystem::initialize()
addFile(createGeneratedFile("mounts", procfs$mounts));
addFile(createGeneratedFile("kmalloc", procfs$kmalloc));
addFile(createGeneratedFile("summary", procfs$summary));
addFile(createGeneratedFile("cpuinfo", procfs$cpuinfo));
return true;
}