Messages in this thread Patch in this message | | | Subject | [PATCH 1/2] x86 boot: add E820_RESVD_KERN | From | "Huang, Ying" <> | Date | Thu, 26 Jun 2008 14:32:58 +0800 |
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This patch add a new type to E820 table named E820_RESVD_KERN, which is used for memory area reserved for kernel itself instead of BIOS.
This patch is based on latest x86/master branch of git-x86 tree and has been tested on i386 and x86_64 platform.
Signed-off-by: Huang Ying <ying.huang@intel.com>
--- arch/x86/kernel/e820.c | 6 ++++-- include/asm-x86/e820.h | 3 +++ 2 files changed, 7 insertions(+), 2 deletions(-)
--- a/include/asm-x86/e820.h +++ b/include/asm-x86/e820.h @@ -44,6 +44,9 @@ #define E820_ACPI 3 #define E820_NVS 4 +/* reserved RAM used by kernel itself */ +#define E820_RESVD_KERN 128 + #ifndef __ASSEMBLY__ struct e820entry { __u64 addr; /* start of memory segment */ --- a/arch/x86/kernel/e820.c +++ b/arch/x86/kernel/e820.c @@ -120,6 +120,7 @@ void __init e820_print_map(char *who) (e820.map[i].addr + e820.map[i].size)); switch (e820.map[i].type) { case E820_RAM: + case E820_RESVD_KERN: printk(KERN_CONT "(usable)\n"); break; case E820_RESERVED: @@ -611,7 +612,7 @@ void __init e820_mark_nosave_regions(uns register_nosave_region(pfn, PFN_UP(ei->addr)); pfn = PFN_DOWN(ei->addr + ei->size); - if (ei->type != E820_RAM) + if (ei->type != E820_RAM && ei->type != E820_RESVD_KERN) register_nosave_region(PFN_UP(ei->addr), pfn); if (pfn >= limit_pfn) @@ -977,7 +978,7 @@ u64 __init early_reserve_e820(u64 startt return 0; addr = round_down(start + size - sizet, align); - e820_update_range(addr, sizet, E820_RAM, E820_RESERVED); + e820_update_range(addr, sizet, E820_RAM, E820_RESVD_KERN); printk(KERN_INFO "update e820 for early_reserve_e820\n"); update_e820(); @@ -1191,6 +1192,7 @@ void __init e820_reserve_resources(void) res = alloc_bootmem_low(sizeof(struct resource) * e820.nr_map); for (i = 0; i < e820.nr_map; i++) { switch (e820.map[i].type) { + case E820_RESVD_KERN: case E820_RAM: res->name = "System RAM"; break; case E820_ACPI: res->name = "ACPI Tables"; break; case E820_NVS: res->name = "ACPI Non-volatile Storage"; break;
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