diff options
Diffstat (limited to 'arch/ia64/kernel/efi.c')
| -rw-r--r-- | arch/ia64/kernel/efi.c | 73 |
1 files changed, 71 insertions, 2 deletions
diff --git a/arch/ia64/kernel/efi.c b/arch/ia64/kernel/efi.c index 0ce1db504..c4383b97f 100644 --- a/arch/ia64/kernel/efi.c +++ b/arch/ia64/kernel/efi.c @@ -5,15 +5,18 @@ * * Copyright (C) 1999 VA Linux Systems * Copyright (C) 1999 Walt Drummond <drummond@valinux.com> - * Copyright (C) 1999 Hewlett-Packard Co. + * Copyright (C) 1999-2000 Hewlett-Packard Co. * Copyright (C) 1999 David Mosberger-Tang <davidm@hpl.hp.com> - * Copyright (C) 1999 Stephane Eranian <eranian@hpl.hp.com> + * Copyright (C) 1999-2000 Stephane Eranian <eranian@hpl.hp.com> * * All EFI Runtime Services are not implemented yet as EFI only * supports physical mode addressing on SoftSDV. This is to be fixed * in a future version. --drummond 1999-07-20 * * Implemented EFI runtime services and virtual mode calls. --davidm + * + * Goutham Rao: <goutham.rao@intel.com> + * Skip non-WB memory and ignore empty memory ranges. */ #include <linux/kernel.h> #include <linux/init.h> @@ -22,6 +25,7 @@ #include <asm/efi.h> #include <asm/io.h> +#include <asm/pgtable.h> #include <asm/processor.h> #define EFI_DEBUG 0 @@ -172,6 +176,14 @@ efi_memmap_walk (efi_freemem_callback_t callback, void *arg) continue; } + if (!(md->attribute & EFI_MEMORY_WB)) + continue; + if (md->num_pages == 0) { + printk("efi_memmap_walk: ignoring empty region at 0x%lx", + md->phys_addr); + continue; + } + curr.start = PAGE_OFFSET + md->phys_addr; curr.end = curr.start + (md->num_pages << 12); @@ -207,6 +219,61 @@ efi_memmap_walk (efi_freemem_callback_t callback, void *arg) } } +/* + * Look for the PAL_CODE region reported by EFI and maps it using an + * ITR to enable safe PAL calls in virtual mode. See IA-64 Processor + * Abstraction Layer chapter 11 in ADAG + */ +static void +map_pal_code (void) +{ + void *efi_map_start, *efi_map_end, *p; + efi_memory_desc_t *md; + u64 efi_desc_size; + int pal_code_count=0; + u64 mask, flags; + u64 vaddr; + + efi_map_start = __va(ia64_boot_param.efi_memmap); + efi_map_end = efi_map_start + ia64_boot_param.efi_memmap_size; + efi_desc_size = ia64_boot_param.efi_memdesc_size; + + for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) { + md = p; + if (md->type != EFI_PAL_CODE) continue; + + if (++pal_code_count > 1) { + printk(KERN_ERR "Too many EFI Pal Code memory ranges, dropped @ %lx\n", + md->phys_addr); + continue; + } + mask = ~((1 << _PAGE_SIZE_4M)-1); /* XXX should be dynamic? */ + vaddr = PAGE_OFFSET + md->phys_addr; + + printk(__FUNCTION__": mapping PAL code [0x%lx-0x%lx) into [0x%lx-0x%lx)\n", + md->phys_addr, md->phys_addr + (md->num_pages << 12), + vaddr & mask, (vaddr & mask) + 4*1024*1024); + + /* + * Cannot write to CRx with PSR.ic=1 + */ + ia64_clear_ic(flags); + + /* + * ITR0/DTR0: used for kernel code/data + * ITR1/DTR1: used by HP simulator + * ITR2/DTR2: map PAL code + * ITR3/DTR3: used to map PAL calls buffer + */ + ia64_itr(0x1, 2, vaddr & mask, + pte_val(mk_pte_phys(md->phys_addr, + __pgprot(__DIRTY_BITS|_PAGE_PL_0|_PAGE_AR_RX))), + _PAGE_SIZE_4M); + local_irq_restore(flags); + ia64_srlz_i (); + } +} + void __init efi_init (void) { @@ -291,6 +358,8 @@ efi_init (void) } } #endif + + map_pal_code(); } void |