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x86: Add early platform detection

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Platforms like Moorestown require early setup and want to avoid the
call to reserve_ebda_region. The x86_init override is too late when
the MRST detection happens in setup_arch. Move the default i386
x86_init overrides and the call to reserve_ebda_region into a separate
function which is called as the default of a switch case depending on
the hardware_subarch id in boot params. This allows us to add a case
for MRST and let MRST have its own early setup function.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner
2009-08-29 15:03:59 +02:00
parent dd0a70c8f9
commit 47a3d5da70
4 changed files with 20 additions and 9 deletions
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22
arch/x86/kernel/head32.c
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@@ -15,6 +15,17 @@
#include <asm/trampoline.h>
#include <asm/apic.h>
#include <asm/io_apic.h>
#include <asm/bios_ebda.h>
static void __init i386_default_early_setup(void)
{
/* Initilize 32bit specific setup functions */
x86_init.resources.probe_roms = probe_roms;
x86_init.resources.reserve_resources = i386_reserve_resources;
x86_init.mpparse.setup_ioapic_ids = setup_ioapic_ids_from_mpc;
reserve_ebda_region();
}
void __init i386_start_kernel(void)
{
@@ -31,12 +42,13 @@ void __init i386_start_kernel(void)
reserve_early(ramdisk_image, ramdisk_end, "RAMDISK");
}
#endif
/* Initilize 32bit specific setup functions */
x86_init.resources.probe_roms = probe_roms;
x86_init.resources.reserve_resources = i386_reserve_resources;
x86_init.mpparse.setup_ioapic_ids = setup_ioapic_ids_from_mpc;
x86_init.resources.reserve_ebda_region();
/* Call the subarch specific early setup function */
switch (boot_params.hdr.hardware_subarch) {
default:
i386_default_early_setup();
break;
}
/*
* At this point everything still needed from the boot loader