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x86: use ELF section to list CPU vendor specific code

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Replace the hardcoded list of initialization functions for each CPU
vendor by a list in an ELF section, which is read at initialization in
arch/x86/kernel/cpu/cpu.c to fill the cpu_devs[] array. The ELF
section, named .x86cpuvendor.init, is reclaimed after boot, and
contains entries of type "struct cpu_vendor_dev" which associates a
vendor number with a pointer to a "struct cpu_dev" structure.

This first modification allows to remove all the VENDOR_init_cpu()
functions.

This patch also removes the hardcoded calls to early_init_amd() and
early_init_intel(). Instead, we add a "c_early_init" member to the
cpu_dev structure, which is then called if not NULL by the generic CPU
initialization code. Unfortunately, in early_cpu_detect(), this_cpu is
not yet set, so we have to use the cpu_devs[] array directly.

This patch is part of the Linux Tiny project, and is needed for
further patch that will allow to disable compilation of unused CPU
support code.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Petazzoni
2008-02-15 12:00:23 +01:00
committed by Ingo Molnar
parent bc7c314d70
commit 03ae5768b6
10 changed files with 46 additions and 69 deletions
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5
arch/x86/kernel/cpu/amd.c
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@@ -63,7 +63,7 @@ static __cpuinit int amd_apic_timer_broken(void)
int force_mwait __cpuinitdata;
void __cpuinit early_init_amd(struct cpuinfo_x86 *c)
static void __cpuinit early_init_amd(struct cpuinfo_x86 *c)
{
if (cpuid_eax(0x80000000) >= 0x80000007) {
c->x86_power = cpuid_edx(0x80000007);
@@ -336,6 +336,7 @@ static struct cpu_dev amd_cpu_dev __cpuinitdata = {
}
},
},
.c_early_init = early_init_amd,
.c_init = init_amd,
.c_size_cache = amd_size_cache,
};
@@ -345,3 +346,5 @@ int __init amd_init_cpu(void)
cpu_devs[X86_VENDOR_AMD] = &amd_cpu_dev;
return 0;
}
cpu_vendor_dev_register(X86_VENDOR_AMD, &amd_cpu_dev);