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| author | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2011-08-28 18:32:30 +0200 |
|---|---|---|
| committer | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2011-08-28 18:32:30 +0200 |
| commit | 3d4e83e3e22b16aeeab0c75c290a3846d1ea99f7 (patch) | |
| tree | c4a83d2ff36118a58062f9efd7a5cfbd9df21f4f /i386/i386at | |
| parent | ce6698ce59c7524986324469c679d564a52099ba (diff) | |
Rework memory mapping reservation
* i386/i386/vm_param.h (VM_KERNEL_MAP_SIZE): Define to 192MiB.
* i386/i386at/model_dep.c (mem_size_init): Use VM_KERNEL_MAP_SIZE instead of
1/6 factor.
* i386/intel/pmap.c (morevm): Remove.
(pmap_bootstrap): Use VM_KERNEL_MAP_SIZE instead of morevm.
Diffstat (limited to 'i386/i386at')
| -rw-r--r-- | i386/i386at/model_dep.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/i386/i386at/model_dep.c b/i386/i386at/model_dep.c index 4e7093c..f6e797c 100644 --- a/i386/i386at/model_dep.c +++ b/i386/i386at/model_dep.c @@ -261,6 +261,8 @@ void db_reset_cpu(void) void mem_size_init(void) { + vm_offset_t max_phys_size; + /* Physical memory on all PCs starts at physical address 0. XX make it a constant. */ phys_first_addr = 0; @@ -285,12 +287,13 @@ mem_size_init(void) printf("AT386 boot: physical memory from 0x%x to 0x%x\n", phys_first_addr, phys_last_addr); - /* Reserve 1/6 of the memory address space for virtual mappings. + /* Reserve room for virtual mappings. * Yes, this loses memory. Blame i386. */ - if (phys_last_addr > ((VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS) / 6) * 5) { - phys_last_addr = ((VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS) / 6) * 5; + max_phys_size = VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS - VM_KERNEL_MAP_SIZE; + if (phys_last_addr - phys_first_addr > max_phys_size) { + phys_last_addr = phys_first_addr + max_phys_size; printf("Truncating memory size to %dMiB\n", (phys_last_addr - phys_first_addr) / (1024 * 1024)); - /* TODO Xen: free lost memory */ + /* TODO Xen: be nice, free lost memory */ } phys_first_addr = round_page(phys_first_addr); |