Messages in this thread Patch in this message | | | From | Matt Fleming <> | Subject | [PATCH 9/9] x86, efi: Make efi_call_phys_prelog() CONFIG_RELOCATABLE-aware | Date | Thu, 11 Aug 2011 11:59:46 +0100 |
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From: Matt Fleming <matt.fleming@linux.intel.com>
efi_call_phys_prelog() assumes that the kernel was loaded at a physical address within the first 8MB of ram, usually 0x1000000. However, this isn't the case with a CONFIG_RELOCATABLE=y kernel which could have been loaded anywhere in the physical address space.
Replace the hardcoded pgd_index(0) and pgd_index(PAGE_OFFSET) with the runtime addresses of the kernel in the physical and virtual space, respectively.
Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Matthew Garrett <mjg@redhat.com> Signed-off-by: Matt Fleming <matt.fleming@linux.intel.com> --- arch/x86/platform/efi/efi_32.c | 22 +++++++++++++--------- 1 files changed, 13 insertions(+), 9 deletions(-)
diff --git a/arch/x86/platform/efi/efi_32.c b/arch/x86/platform/efi/efi_32.c index 5cab48e..1156e9a 100644 --- a/arch/x86/platform/efi/efi_32.c +++ b/arch/x86/platform/efi/efi_32.c @@ -44,8 +44,12 @@ void efi_call_phys_prelog(void) { unsigned long cr4; unsigned long temp; + unsigned long phys_addr, virt_addr; struct desc_ptr gdt_descr; + virt_addr = (unsigned long)_text; + phys_addr = virt_addr - PAGE_OFFSET; + local_irq_save(efi_rt_eflags); /* @@ -57,18 +61,18 @@ void efi_call_phys_prelog(void) if (cr4 & X86_CR4_PAE) { efi_bak_pg_dir_pointer[0].pgd = - swapper_pg_dir[pgd_index(0)].pgd; - swapper_pg_dir[0].pgd = - swapper_pg_dir[pgd_index(PAGE_OFFSET)].pgd; + swapper_pg_dir[pgd_index(phys_addr)].pgd; + swapper_pg_dir[pgd_index(phys_addr)].pgd = + swapper_pg_dir[pgd_index(virt_addr)].pgd; } else { efi_bak_pg_dir_pointer[0].pgd = - swapper_pg_dir[pgd_index(0)].pgd; + swapper_pg_dir[pgd_index(phys_addr)].pgd; efi_bak_pg_dir_pointer[1].pgd = - swapper_pg_dir[pgd_index(0x400000)].pgd; - swapper_pg_dir[pgd_index(0)].pgd = - swapper_pg_dir[pgd_index(PAGE_OFFSET)].pgd; - temp = PAGE_OFFSET + 0x400000; - swapper_pg_dir[pgd_index(0x400000)].pgd = + swapper_pg_dir[pgd_index(phys_addr + 0x400000)].pgd; + swapper_pg_dir[pgd_index(phys_addr)].pgd = + swapper_pg_dir[pgd_index(virt_addr)].pgd; + temp = virt_addr + 0x400000; + swapper_pg_dir[pgd_index(phys_addr + 0x400000)].pgd = swapper_pg_dir[pgd_index(temp)].pgd; } -- 1.7.4.4
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