diff options
Diffstat (limited to 'arch/x86/kernel/setup.c')
| -rw-r--r-- | arch/x86/kernel/setup.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index bd52f9da17c..68dffeceb19 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -116,9 +116,11 @@ #include <asm/prom.h> /* - * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries. - * The direct mapping extends to max_pfn_mapped, so that we can directly access - * apertures, ACPI and other tables without having to play with fixmaps. + * max_low_pfn_mapped: highest direct mapped pfn under 4GB + * max_pfn_mapped: highest direct mapped pfn over 4GB + * + * The direct mapping only covers E820_RAM regions, so the ranges and gaps are + * represented by pfn_mapped */ unsigned long max_low_pfn_mapped; unsigned long max_pfn_mapped; |