Date: Sun, 6 Apr 2003 20:58:41 -0700 (PDT) From: Peter Wemm <peter@FreeBSD.org> To: Perforce Change Reviews <perforce@freebsd.org> Subject: PERFORCE change 28396 for review Message-ID: <200304070358.h373wfpU023840@repoman.freebsd.org>
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http://perforce.freebsd.org/chv.cgi?CH=28396 Change 28396 by peter@peter_overcee on 2003/04/06 20:57:50 this is a bit gross, but is a replacement for create_pagetables from locore.s. I want to do this differently but this is a useful checkpoint. Affected files ... .. //depot/projects/hammer/sys/x86_64/x86_64/machdep.c#42 edit Differences ... ==== //depot/projects/hammer/sys/x86_64/x86_64/machdep.c#42 (text+ko) ==== @@ -1042,21 +1042,15 @@ return (ret); } -void -hammer_time(void) +static void +create_pagetables(void) { - caddr_t kmdp; - int gsel_tss, off, x; - struct region_descriptor r_gdt, r_idt; - struct pcpu *pc; u_int64_t p0kpa; u_int64_t p0upa; u_int64_t KPTphys; - u_int64_t first; + int i; - first = physfree; -printf("made it to hammer_time! first = 0x%x\n", first); - + /* Allocate pages */ KPTphys = allocpages(NKPT); printf("KPTphys = 0x%lx\n", KPTphys); IdlePML4 = allocpages(1); @@ -1070,6 +1064,63 @@ p0kpa = allocpages(KSTACK_PAGES); printf("p0kpa = 0x%lx\n", p0kpa); + /* Fill in the underlying page table pages */ + /* Read-only from zero to physfree */ + /* XXX not actually used, underneath 2M pages */ + for (i = 0; (i << PAGE_SHIFT) < physfree; i++) { + ((pt_entry_t *)KPTphys)[i] = i << PAGE_SHIFT; + ((pt_entry_t *)KPTphys)[i] |= PG_RW; + } + + /* Map from zero to end of allocations under 2M pages */ + for (i = 0; (i << PDRSHIFT) < physfree; i++) { + ((pd_entry_t *)IdlePTD)[i] = i << PDRSHIFT; + ((pd_entry_t *)IdlePTD)[i] |= PG_RW | PG_V | PG_PS; + } + + /* Now map the page tables at their location within PTmap */ + for (i = 0; i < NKPT; i++) { + ((pd_entry_t *)IdlePTD)[i + KPTDI] = KPTphys + (i << PAGE_SHIFT); + ((pd_entry_t *)IdlePTD)[i + KPTDI] |= PG_RW | PG_V; + } + + /* Now map the PTD at the top of the PTmap (ie: PTD[]) */ + for (i = 0; i < NPGPTD; i++) { + ((pd_entry_t *)IdlePTD)[i + PTDPTDI] = IdlePTD + (i << PAGE_SHIFT); + ((pd_entry_t *)IdlePTD)[i + PTDPTDI] |= PG_RW | PG_V; + } + + /* And connect up the PTD to the PDP */ + /* XXX index 1 == 1GB, where the KERNBASE is for now */ + ((pdp_entry_t *)IdlePDP)[1] = IdlePTD; + ((pdp_entry_t *)IdlePDP)[1] |= PG_RW | PG_V; + + /* And connect up the PDP to the PML4 */ + ((pdp_entry_t *)IdlePML4)[0] = IdlePDP; + ((pdp_entry_t *)IdlePML4)[0] |= PG_RW | PG_V | PG_U; +} + +void +hammer_time(void) +{ + caddr_t kmdp; + int gsel_tss, off, x; + struct region_descriptor r_gdt, r_idt; + struct pcpu *pc; + u_int64_t first; + + first = physfree; +printf("It is hammer_time!\n"); +printf("first = 0x%lx\n", first); + + create_pagetables(); + +printf("got to the end; activating page tables...\n"); + + load_cr3(IdlePML4); + +printf("it worked!\n"); +printf("yippee!\n"); for(;;); proc0.p_uarea = proc0uarea;
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