diff options
| author | Peter Wemm <peter@FreeBSD.org> | 2001-08-23 01:47:26 +0000 |
|---|---|---|
| committer | Peter Wemm <peter@FreeBSD.org> | 2001-08-23 01:47:26 +0000 |
| commit | 520f648f423d420d2e9d9850efa4177bbfb030a0 (patch) | |
| tree | a9ec95e3548dc38ca50dadb5c5ef1b2f21eedb30 /sys | |
| parent | 2ddb1aff195a5217089e42994b509ea386548ab7 (diff) | |
Notes
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/pc98/i386/machdep.c | 18 | ||||
| -rw-r--r-- | sys/pc98/pc98/machdep.c | 18 |
2 files changed, 4 insertions, 32 deletions
diff --git a/sys/pc98/i386/machdep.c b/sys/pc98/i386/machdep.c index ae40b8a7a10a0..940e034e91414 100644 --- a/sys/pc98/i386/machdep.c +++ b/sys/pc98/i386/machdep.c @@ -1939,25 +1939,11 @@ init386(first) /* make ldt memory segments */ /* - * The data segment limit must not cover the user area because we - * don't want the user area to be writable in copyout() etc. (page - * level protection is lost in kernel mode on 386's). Also, we - * don't want the user area to be writable directly (page level - * protection of the user area is not available on 486's with - * CR0_WP set, because there is no user-read/kernel-write mode). - * * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it * should be spelled ...MAX_USER... */ -#define VM_END_USER_RW_ADDRESS VM_MAXUSER_ADDRESS - /* - * The code segment limit has to cover the user area until we move - * the signal trampoline out of the user area. This is safe because - * the code segment cannot be written to directly. - */ -#define VM_END_USER_R_ADDRESS (VM_END_USER_RW_ADDRESS + UPAGES * PAGE_SIZE) - ldt_segs[LUCODE_SEL].ssd_limit = atop(VM_END_USER_R_ADDRESS - 1); - ldt_segs[LUDATA_SEL].ssd_limit = atop(VM_END_USER_RW_ADDRESS - 1); + ldt_segs[LUCODE_SEL].ssd_limit = atop(VM_MAXUSER_ADDRESS - 1); + ldt_segs[LUDATA_SEL].ssd_limit = atop(VM_MAXUSER_ADDRESS - 1); for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++) ssdtosd(&ldt_segs[x], &ldt[x].sd); diff --git a/sys/pc98/pc98/machdep.c b/sys/pc98/pc98/machdep.c index ae40b8a7a10a0..940e034e91414 100644 --- a/sys/pc98/pc98/machdep.c +++ b/sys/pc98/pc98/machdep.c @@ -1939,25 +1939,11 @@ init386(first) /* make ldt memory segments */ /* - * The data segment limit must not cover the user area because we - * don't want the user area to be writable in copyout() etc. (page - * level protection is lost in kernel mode on 386's). Also, we - * don't want the user area to be writable directly (page level - * protection of the user area is not available on 486's with - * CR0_WP set, because there is no user-read/kernel-write mode). - * * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it * should be spelled ...MAX_USER... */ -#define VM_END_USER_RW_ADDRESS VM_MAXUSER_ADDRESS - /* - * The code segment limit has to cover the user area until we move - * the signal trampoline out of the user area. This is safe because - * the code segment cannot be written to directly. - */ -#define VM_END_USER_R_ADDRESS (VM_END_USER_RW_ADDRESS + UPAGES * PAGE_SIZE) - ldt_segs[LUCODE_SEL].ssd_limit = atop(VM_END_USER_R_ADDRESS - 1); - ldt_segs[LUDATA_SEL].ssd_limit = atop(VM_END_USER_RW_ADDRESS - 1); + ldt_segs[LUCODE_SEL].ssd_limit = atop(VM_MAXUSER_ADDRESS - 1); + ldt_segs[LUDATA_SEL].ssd_limit = atop(VM_MAXUSER_ADDRESS - 1); for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++) ssdtosd(&ldt_segs[x], &ldt[x].sd); |