diff options
| author | Yinghai Lu <yhlu.kernel@gmail.com> | 2008-07-10 20:38:26 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-07-11 10:24:04 +0200 |
| commit | f361a450bf1ad14e2b003217dbf3958638631265 (patch) | |
| tree | 10c1e4dcc0047f6c37387cada6a0bceba088d2d2 /arch/x86/kernel/setup.c | |
| parent | f302a5bbe5eb95f3d4227d5bd0e9b92b1b125f4f (diff) | |
x86: introduce max_low_pfn_mapped for 64-bit
when more than 4g memory is installed, don't map the big hole below 4g.
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/setup.c')
| -rw-r--r-- | arch/x86/kernel/setup.c | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index a7c3471ea17c..86fc2d624270 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -713,14 +713,14 @@ void __init setup_arch(char **cmdline_p) * partially used pages are not usable - thus * we are rounding upwards: */ - max_pfn = e820_end(); + max_pfn = e820_end_of_ram_pfn(); /* preallocate 4k for mptable mpc */ early_reserve_e820_mpc_new(); /* update e820 for memory not covered by WB MTRRs */ mtrr_bp_init(); if (mtrr_trim_uncached_memory(max_pfn)) - max_pfn = e820_end(); + max_pfn = e820_end_of_ram_pfn(); #ifdef CONFIG_X86_32 /* max_low_pfn get updated here */ @@ -732,12 +732,26 @@ void __init setup_arch(char **cmdline_p) /* How many end-of-memory variables you have, grandma! */ /* need this before calling reserve_initrd */ - max_low_pfn = max_pfn; + if (max_pfn > (1UL<<(32 - PAGE_SHIFT))) + max_low_pfn = e820_end_of_low_ram_pfn(); + else + max_low_pfn = max_pfn; + high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1; #endif /* max_pfn_mapped is updated here */ - max_pfn_mapped = init_memory_mapping(0, (max_low_pfn << PAGE_SHIFT)); + max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT); + max_pfn_mapped = max_low_pfn_mapped; + +#ifdef CONFIG_X86_64 + if (max_pfn > max_low_pfn) { + max_pfn_mapped = init_memory_mapping(1UL<<32, + max_pfn<<PAGE_SHIFT); + /* can we preseve max_low_pfn ?*/ + max_low_pfn = max_pfn; + } +#endif /* * NOTE: On x86-32, only from this point on, fixmaps are ready for use. |