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Kernel: Move all CPU feature initialization into cpu_setup()

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..and do it very very early in boot.
This commit is contained in:
Andreas Kling 2020-01-18 10:11:29 +01:00
parent 210adaeca6
commit 6fea316611
4 changed files with 61 additions and 90 deletions
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27
Kernel/init.cpp
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@ -277,7 +277,7 @@ extern "C" [[noreturn]] void init()
if (cmdline && bad_prefix_check(reinterpret_cast<const char*>(cmdline), "serial_debug"))
set_serial_debug(true);
detect_cpu_features();
cpu_setup();
kmalloc_init();
slab_alloc_init();
@ -309,32 +309,7 @@ extern "C" [[noreturn]] void init()
kprintf("Starting SerenityOS...\n");
if (g_cpu_supports_sse) {
sse_init();
kprintf("x86: SSE support enabled\n");
}
if (g_cpu_supports_umip) {
asm volatile(
"mov %cr4, %eax\n"
"orl $0x800, %eax\n"
"mov %eax, %cr4\n");
kprintf("x86: UMIP support enabled\n");
}
if (g_cpu_supports_tsc) {
asm volatile(
"mov %cr4, %eax\n"
"orl $0x4, %eax\n"
"mov %eax, %cr4\n");
kprintf("x86: RDTSC support restricted\n");
}
if (g_cpu_supports_rdrand) {
kprintf("x86: Using RDRAND for good randomness\n");
} else {
kprintf("x86: No RDRAND support detected. Randomness will be shitty\n");
}
__stack_chk_guard = get_good_random<u32>();