tnt2 skel

[netwatch.git] / aseg-paging / pagingstub.c

diff --git a/aseg-paging/pagingstub.c b/aseg-paging/pagingstub.c
index 0115713bf93d29e4e990243aade030bb27a22a36..7d430b92c5e200d1efb2d61d3f3b9510833972fb 100644 (file)
--- a/aseg-paging/pagingstub.c
+++ b/aseg-paging/pagingstub.c
@@ -5,6 +5,7 @@
 #include <smi.h>
 #include <pci-bother.h>
 #include <serial.h>
 #include <smi.h>
 #include <pci-bother.h>
 #include <serial.h>

+#include <output.h>

 #include "traps.h"
 #include "../net/net.h"
 #include "vga-overlay.h"
 #include "traps.h"
 #include "../net/net.h"
 #include "vga-overlay.h"


@@ -12,12 +13,10 @@
 extern void smi_init();
 #include "vm_flags.h"
 
 extern void smi_init();
 #include "vm_flags.h"
 

+extern void smi_entry();

 void set_cr0(unsigned int);
 void ps_switch_stack (void (*call)(), int stack);
 
 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__; \
 #define get_cr0() \
     ({ \
         register unsigned int _temp__; \


@@ -35,107 +34,166 @@ void smi_entry();
 
 #define MAP_FLAGS      (PTE_PRESENT | PTE_READ_WRITE)
 
 
 #define MAP_FLAGS      (PTE_PRESENT | PTE_READ_WRITE)
 

-void * pt_setup(int smbase, int tseg_start, int tseg_size) {
+static int initialized = 0;
+static int paging_enb = 0;
+static unsigned long *pd;
+
+extern int _bss, _bssend, _end;
+
+static unsigned long curmapped = 0xFFFFFFFF;
+
+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;
+       if (_virt >= 0x1F0000 && _virt < 0x1F2000)
+               return _virt - 0x1F0000 + 0x1FF80000;
+       if ((_virt & ~0xFFF) == 0x4000)
+               return _virt - 0x4000 + curmapped;
+       
+       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 >= 0x1FF82000 && phys < 0x20000000)
+               return (void*)(phys - 0x1FF82000 + 0x200000);
+       if (phys >= 0x1FF80000 && phys < 0x1FF82000)
+               return (void*)(phys - 0x1FF80000 + 0x1F0000);
+               
+       if ((phys & ~0xFFF) != curmapped)       /* If it's not mapped, map it in. */
+       {
+               curmapped = phys & ~0xFFF;
+               addmap(0x4000, curmapped);
+               asm volatile("invlpg 0x4000");
+       }
+       return (void*)(0x4000 + (phys & 0xFFF));
+}
+
+int addmap(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;
+}
+
+void *demap(unsigned long client_pd, unsigned long vaddr)
+{
+       unsigned long pde = ((unsigned long *)p2v(client_pd))[PDE_FOR(vaddr)];
+       unsigned long pte;
+       
+       if (!(pde & PTE_PRESENT))
+               return (void*)0x0;
+       pte = ((unsigned long *)p2v(ADDR_12_MASK(pde)))[PTE_FOR(vaddr)];
+       if (!(pte & PTE_PRESENT))
+               return (void*)0x0;
+       return p2v((pte & ~0xFFF) + (vaddr & 0xFFF));
+}
+
+static void pt_setup(int tseg_start, int tseg_size) {

        int i;
        int i;

-       outb(0x80, 0x51);

 
 

-       /* The page directory and page table live at SMBASE and SMBASE + 0x1000,
-        * respectively; clear them. */
-       int * pagedirectory = (int *) tseg_start;
-       int * pagetable = (int *) (tseg_start + 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);
+       
+       pd = pagedirectory;

 
        /* Clear out the page directory except for one entry pointing to the
         * page table, and clear the page table entirely. */
 
        /* 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] = (tseg_start + 0x1000) | PTE_PRESENT | PTE_READ_WRITE;
        pagedirectory[0] = (tseg_start + 0x1000) | PTE_PRESENT | PTE_READ_WRITE;

-       outb(0x80, 0x53);

        for (i = 1; i < 1024; i++)
        for (i = 1; i < 1024; i++)

-       {

                pagedirectory[i] = 0;
                pagedirectory[i] = 0;

-       }

 
 

-       outb(0x80, 0x54);

        for (i = 0; i < 1024; i++)
        for (i = 0; i < 1024; i++)

-       {

                pagetable[i] = 0;
                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;
-
-       /* 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.  */
-
-       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 0x0A0000:0x0BFFFF to itself. */
+       for (i = 0; i < 32; i++)
+               addmap(0xA0000 + i * 0x1000, 0xA0000 + i * 0x1000);

 
 

-       /* Map 0x200000 to TSEG */
-       for (i = 0; i < 128; i++) {
-               pagetable[0x200 + i] = (tseg_start + 0x2000 + i * 0x1000) | MAP_FLAGS;
-       }
+       /* Map 0x200000:0x300000 to TSEG data */
+       for (i = 0; i < 256; i++)
+               addmap(0x200000 + i * 0x1000, tseg_start + (i + 2) * 0x1000);

 
 

-       /* 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 */
         * RAM the first time around */

-       for (i = 0; i < 256; i++) {
-               pagetable[0x300 + i] = (0x200000 + i * 0x1000) | MAP_FLAGS;
-       }
+       for (i = 0; i < 256; i++)
+               addmap(0x300000 + i * 0x1000, 0x200000 + i * 0x1000);

 
 

-       outb(0x80, 0x57);
-       return pagedirectory;
+       /* Map 0x1F0000:0x1F2000 to TSEG paging info */
+       for (i = 0; i < 2; i++)
+               addmap(0x1F0000 + i * 0x1000, tseg_start + i * 0x1000);

 }
 
 void c_entry(void)
 {
 }
 
 void c_entry(void)
 {

-       unsigned char *bp;
+       paging_enb = 0;

 
 

-       outb(0x80, 0x41);
-       if (!entry_initialized)
-               pt_setup(0xA0000, 0x1FF80000, 0x80000);
+       outb(0x80, 0x01);       
+       if (!initialized)
+               pt_setup(0x1FF80000, 0x80000);
+       outb(0x80, 0x02);

                
        /* Enable paging. */
                
        /* Enable paging. */

-       outb(0x80, 0x42);
-       set_cr3(0x1FF80000);
+       set_cr3((unsigned long)pd);

        set_cr0(get_cr0() | CR0_PG);
        set_cr0(get_cr0() | CR0_PG);

-       
-       outb(0x80, 0x43);
+       outb(0x80, 0x03);
+       paging_enb = 1;

 
 

-       if (!entry_initialized) {
+       /* If this is the first goround, copy in data. */
+       if (!initialized)
+       {
+               unsigned char *p;

                
                

-               /* If needed, copy in data. */
-               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, 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();
                serial_init();

-               dolog("Paging enabled.");
+               dolog("Evacuation to TSEG complete.");

        }
        }

+       
+       outb(0x80, 0x06);

 
        traps_install();
 
        traps_install();

+       
+       outb(0x80, 0x07);

 
 

-       if (!entry_initialized) {
-               smi_init();
+       if (!initialized)
+       {
+               smi_init();     /* Run the firstrun. */
+               outb(0x80, 0x08);

                
                

-               entry_initialized = 1;
+               initialized = 1;

        }
        }

-
-       outb(0x80, 0x44);
+       
+       outb(0x80, 0x09);

        ps_switch_stack(smi_entry, 0x270000);
        outb(0x80, 0xFA);
 }
        ps_switch_stack(smi_entry, 0x270000);
        outb(0x80, 0xFA);
 }