X-Git-Url: http://git.joshuawise.com/netwatch.git/blobdiff_plain/9e2a82e4e9495f33b8e6423c335a9a157f056254..923ea2c2cd9df7f02ddcfd8c543f63b76be44660:/aseg-paging/pagingstub.c diff --git a/aseg-paging/pagingstub.c b/aseg-paging/pagingstub.c index 6c85157..161dc1f 100644 --- a/aseg-paging/pagingstub.c +++ b/aseg-paging/pagingstub.c @@ -4,17 +4,19 @@ #include #include #include +#include +#include +#include "traps.h" #include "../net/net.h" #include "vga-overlay.h" +extern void smi_init(); #include "vm_flags.h" -#include "pagetable.h" +extern void smi_entry(); void set_cr0(unsigned int); +void ps_switch_stack (void (*call)(), int stack); -extern int entry_initialized; -extern int _bss, _bssend, _end; -void smi_entry(); #define get_cr0() \ ({ \ register unsigned int _temp__; \ @@ -32,97 +34,135 @@ void smi_entry(); #define MAP_FLAGS (PTE_PRESENT | PTE_READ_WRITE) -void * pt_setup(int smbase) { +static int initialized = 0; +static int paging_enb = 0; +static unsigned long *pd; + +extern int _bss, _bssend, _end; + +unsigned long v2p(void *virt) +{ + unsigned long _virt = (unsigned long)virt; + + if (!paging_enb) + return _virt; + + if (_virt >= 0xA0000 && _virt < 0xC0000) + return _virt; + if (_virt >= 0x200000 && _virt < 0x300000) + return _virt - 0x200000 + /* XXX */ 0x1FF82000; + outputf("WARNING: v2p(%08x)", _virt); + return 0xFFFFFFFF; +} + +void *p2v(unsigned long phys) +{ + if (!paging_enb) + return (void*)phys; + + if (phys >= 0xA0000 && phys < 0xC0000) + return (void*)phys; + if (phys >= 0x1FF80000 && phys < 0x20000000) + return (void*)(phys - 0x1FF82000 + 0x200000); + outputf("WARNING: p2v(%08x)", phys); + return (void *)0xFFFFFFFF; +} + + +inline int pt_addmap(unsigned long *pd, unsigned long vaddr, unsigned long paddr) +{ + unsigned long pde = ((unsigned long *)p2v((unsigned long)pd))[PDE_FOR(vaddr)]; + unsigned long *pt; + + if (!(pde & PTE_PRESENT)) + return -1; + + pt = (unsigned long *)p2v(ADDR_12_MASK(pde)); + pt[PTE_FOR(vaddr)] = paddr | PTE_PRESENT | PTE_READ_WRITE; + + return 0; +} + +static void * pt_setup(int tseg_start, int tseg_size) { int i; - outb(0x80, 0x51); - /* The page directory and page table live at SMBASE and SMBASE + 0x1000, - * respectively; clear them. */ - int * pagedirectory = (int *) smbase; - int * pagetable = (int *) (smbase + 0x1000); + /* The page directory and page table live at TSEG and TSEG + 0x1000, + * respectively. */ + unsigned long *pagedirectory = (unsigned long *) tseg_start; + unsigned long *pagetable = (unsigned long *) (tseg_start + 0x1000); /* Clear out the page directory except for one entry pointing to the * page table, and clear the page table entirely. */ - outb(0x80, 0x52); - pagedirectory[0] = (smbase + 0x1000) | PTE_PRESENT | PTE_READ_WRITE; - outb(0x80, 0x53); + pagedirectory[0] = (tseg_start + 0x1000) | PTE_PRESENT | PTE_READ_WRITE; for (i = 1; i < 1024; i++) - { pagedirectory[i] = 0; - } - outb(0x80, 0x54); for (i = 0; i < 1024; i++) - { pagetable[i] = 0; - } - outb(0x80, 0x55); - /* The page at 0x10000 - 0x10FFF points to the SMI entry point, - * SMBASE + 0x8000. */ - pagetable[16] = (0x8000 + smbase) | MAP_FLAGS; + /* Map 0x0A0000:0x0BFFFF to itself. */ + for (i = 0; i < 32; i++) + pt_addmap(pagedirectory, 0xA0000 + i * 0x1000, 0xA0000 + i * 0x1000); - /* 0x11000 to 0x1EFFF map to the rest of ASEG up to SMBASE + 0xF000; - * the page containing the saved state is not mappped to our code - * region. */ + /* Map 0x200000:0x300000 to TSEG */ + for (i = 0; i < 256; i++) + pt_addmap(pagedirectory, 0x200000 + i * 0x1000, tseg_start + 0x2000 + i * 0x1000); - for (i = 0; i < 8; i++) - { - pagetable[17 + i] = (i * 0x1000 + smbase) | MAP_FLAGS; - } - - for (i = 0; i < 6; i++) - { - pagetable[25 + i] = (smbase + 0x9000 + i * 0x1000) | MAP_FLAGS; - } - - outb(0x80, 0x56); - /* Map 0xA8000 to itself. */ - - for (i = 0; i < 32; i++) { - pagetable[0xA0 + i] = (0xA0000 + i * 0x1000) | MAP_FLAGS; - } - - /* Map 0x200000 to TSEG */ - for (i = 0; i < 128; i++) { - pagetable[0x200 + i] = (0x1FF80000 + i * 0x1000) | MAP_FLAGS; - } - - /* Map 0x300000 -> 0x200000, so we can copy our code out of + /* Map 0x300000:0x400000 to 0x200000, so we can copy our code out of * RAM the first time around */ - for (i = 0; i < 256; i++) { - /* pagetable[0x300 + i] = (0x200000 + i * 0x1000) | MAP_FLAGS; - */ - pagetable[0x200 + i] = (0x200000 + i * 0x1000) | MAP_FLAGS; - } + for (i = 0; i < 256; i++) + pt_addmap(pagedirectory, 0x300000 + i * 0x1000, 0x200000 + i * 0x1000); - outb(0x80, 0x57); return pagedirectory; } void c_entry(void) { -// unsigned char *bp; - - outb(0x80, 0x41); - char * pagedir = pt_setup(0xA0000); - outb(0x80, 0x43); - set_cr3((int)pagedir); - outb(0x80, 0xA5); - - /* Turn paging on */ + paging_enb = 0; + + outb(0x80, 0x01); + if (!initialized) + pd = pt_setup(0x1FF80000, 0x80000); + outb(0x80, 0x02); + + /* Enable paging. */ + set_cr3((unsigned long)pd); set_cr0(get_cr0() | CR0_PG); - outb(0x80, 0xAA); - if (!entry_initialized) { - outb(0x80, 0xAB); -/* - for (bp = (void *)0x200000; (void *)bp < (void *)&_bss; bp++) - *bp = *(bp + 0x100000); - - for (bp = (void *)&_bss; (void *)bp < (void *)&_bssend; bp++) - *bp = 0; - */ + outb(0x80, 0x03); + paging_enb = 1; + + /* If this is the first goround, copy in data. */ + if (!initialized) + { + unsigned char *p; + + outb(0x80, 0x04); + for (p = (void *)0x200000; (void *)p < (void *)&_bss; p++) + *p = *(p + 0x100000); + for (p = (void *)&_bss; (void *)p < (void *)&_bssend; p++) + *p = 0; + outb(0x80, 0x05); + + /* Only now is it safe to call other functions. */ + serial_init(); + dolog("Evacuation to TSEG complete."); } + + outb(0x80, 0x06); + + traps_install(); + + outb(0x80, 0x07); - smi_entry(); + if (!initialized) + { + smi_init(); /* Run the firstrun. */ + outb(0x80, 0x08); + + initialized = 1; + } + + outb(0x80, 0x09); + ps_switch_stack(smi_entry, 0x270000); + outb(0x80, 0xFA); }