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Set page zero read/write right from the start rather than trying to

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change it later on.
This commit is contained in:
peter 2003-10-10 23:35:15 +00:00
parent 9df08be68d
commit 7c3bdb09ce
2 changed files with 7 additions and 8 deletions
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8
sys/i386/i386/locore.s
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@ -786,8 +786,14 @@ no_kernend:
movl %esi, R(SMPpt) /* relocated to KVM space */
#endif /* SMP */
/* Map read-only from zero to the beginning of the kernel text section */
/* Map page zero read-write so bios32 calls can use it */
xorl %eax, %eax
movl $PG_RW,%edx
movl $PAGE_SIZE,%ecx
fillkptphys(%edx)
/* Map read-only from page 1 to the beginning of the kernel text section */
movl $PAGE_MASK, %eax
xorl %edx,%edx
movl $R(btext),%ecx
addl $PAGE_MASK,%ecx

7
sys/i386/i386/machdep.c
View File

@ -1504,13 +1504,6 @@ getmemsize(int first)
char *cp;
struct bios_smap *smap;
/*
* Change the mapping of the page at address zero from r/o to r/w
* so that vm86 can scribble on this page. Note that this page is
* not in the general free page pool.
*/
pmap_kenter(KERNBASE, 0);
hasbrokenint12 = 0;
TUNABLE_INT_FETCH("hw.hasbrokenint12", &hasbrokenint12);
bzero(&vmf, sizeof(vmf));