diff options
| author | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2006-11-26 20:01:47 +0000 |
|---|---|---|
| committer | Thomas Schwinge <tschwinge@gnu.org> | 2009-06-18 00:26:56 +0200 |
| commit | 4319b1c2e5e9dc7d5c6e145b7363124246f7ac54 (patch) | |
| tree | e3d323dda13ad252c606017d98fcdcf82627dd85 /i386/i386at | |
| parent | 5a091eb5a5a1b22cb2676fe2ecc461b5289fc556 (diff) | |
2006-11-26 Samuel Thibault <samuel.thibault@ens-lyon.org>
Fix i386's 4GiB overflow.
* i386/i386at/model_dep.c (mem_size_init): Truncate memory size to
4GiB.
Diffstat (limited to 'i386/i386at')
| -rw-r--r-- | i386/i386at/model_dep.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/i386/i386at/model_dep.c b/i386/i386at/model_dep.c index 1546077..9f0a1c7 100644 --- a/i386/i386at/model_dep.c +++ b/i386/i386at/model_dep.c @@ -196,11 +196,18 @@ void db_reset_cpu() void mem_size_init() { + vm_size_t phys_last_kb; + /* Physical memory on all PCs starts at physical address 0. XX make it a constant. */ phys_first_addr = 0; - phys_last_addr = 0x100000 + (boot_info.mem_upper * 0x400); + phys_last_kb = 0x400 + boot_info.mem_upper; + /* Avoid 4GiB overflow. */ + if (phys_last_kb < 0x400 || phys_last_kb >= 0x400000) + phys_last_kb = 0x400000 - 1; + + phys_last_addr = phys_last_kb * 0x400; avail_remaining = phys_last_addr - (0x100000 - (boot_info.mem_lower * 0x400) - 0x1000); |