Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

arch/um/kernel/tlb.c

@@ -0,0 +1,369 @@
+/* 
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/mm.h"
+#include "asm/page.h"
+#include "asm/pgalloc.h"
+#include "asm/tlbflush.h"
+#include "choose-mode.h"
+#include "mode_kern.h"
+#include "user_util.h"
+#include "tlb.h"
+#include "mem.h"
+#include "mem_user.h"
+#include "os.h"
+
+#define ADD_ROUND(n, inc) (((n) + (inc)) & ~((inc) - 1))
+
+void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
+                      unsigned long end_addr, int force, int data,
+                      void (*do_ops)(int, struct host_vm_op *, int))
+{
+        pgd_t *npgd;
+        pud_t *npud;
+        pmd_t *npmd;
+        pte_t *npte;
+        unsigned long addr, end;
+        int r, w, x;
+        struct host_vm_op ops[16];
+        int op_index = -1, last_op = sizeof(ops) / sizeof(ops[0]) - 1;
+
+        if(mm == NULL) return;
+
+        for(addr = start_addr; addr < end_addr;){
+                npgd = pgd_offset(mm, addr);
+                if(!pgd_present(*npgd)){
+                        end = ADD_ROUND(addr, PGDIR_SIZE);
+                        if(end > end_addr)
+                                end = end_addr;
+                        if(force || pgd_newpage(*npgd)){
+                                op_index = add_munmap(addr, end - addr, ops,
+                                                      op_index, last_op, data,
+                                                      do_ops);
+                                pgd_mkuptodate(*npgd);
+                        }
+                        addr = end;
+                        continue;
+                }
+
+                npud = pud_offset(npgd, addr);
+                if(!pud_present(*npud)){
+                        end = ADD_ROUND(addr, PUD_SIZE);
+                        if(end > end_addr)
+                                end = end_addr;
+                        if(force || pud_newpage(*npud)){
+                                op_index = add_munmap(addr, end - addr, ops,
+                                                      op_index, last_op, data,
+                                                      do_ops);
+                                pud_mkuptodate(*npud);
+                        }
+                        addr = end;
+                        continue;
+                }
+
+                npmd = pmd_offset(npud, addr);
+                if(!pmd_present(*npmd)){
+                        end = ADD_ROUND(addr, PMD_SIZE);
+                        if(end > end_addr)
+                                end = end_addr;
+                        if(force || pmd_newpage(*npmd)){
+                                op_index = add_munmap(addr, end - addr, ops,
+                                                      op_index, last_op, data,
+                                                      do_ops);
+                                pmd_mkuptodate(*npmd);
+                        }
+                        addr = end;
+                        continue;
+                }
+
+                npte = pte_offset_kernel(npmd, addr);
+                r = pte_read(*npte);
+                w = pte_write(*npte);
+                x = pte_exec(*npte);
+                if(!pte_dirty(*npte))
+                        w = 0;
+                if(!pte_young(*npte)){
+                        r = 0;
+                        w = 0;
+                }
+                if(force || pte_newpage(*npte)){
+                        if(pte_present(*npte))
+                                op_index = add_mmap(addr,
+                                                    pte_val(*npte) & PAGE_MASK,
+                                                    PAGE_SIZE, r, w, x, ops,
+                                                    op_index, last_op, data,
+                                                    do_ops);
+                        else op_index = add_munmap(addr, PAGE_SIZE, ops,
+                                                   op_index, last_op, data,
+                                                   do_ops);
+                }
+                else if(pte_newprot(*npte))
+                        op_index = add_mprotect(addr, PAGE_SIZE, r, w, x, ops,
+                                                op_index, last_op, data,
+                                                do_ops);
+
+                *npte = pte_mkuptodate(*npte);
+                addr += PAGE_SIZE;
+        }
+        (*do_ops)(data, ops, op_index);
+}
+
+int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
+{
+        struct mm_struct *mm;
+        pgd_t *pgd;
+        pud_t *pud;
+        pmd_t *pmd;
+        pte_t *pte;
+        unsigned long addr, last;
+        int updated = 0, err;
+
+        mm = &init_mm;
+        for(addr = start; addr < end;){
+                pgd = pgd_offset(mm, addr);
+                if(!pgd_present(*pgd)){
+                        last = ADD_ROUND(addr, PGDIR_SIZE);
+                        if(last > end)
+                                last = end;
+                        if(pgd_newpage(*pgd)){
+                                updated = 1;
+                                err = os_unmap_memory((void *) addr,
+                                                      last - addr);
+                                if(err < 0)
+                                        panic("munmap failed, errno = %d\n",
+                                              -err);
+                        }
+                        addr = last;
+                        continue;
+                }
+
+                pud = pud_offset(pgd, addr);
+                if(!pud_present(*pud)){
+                        last = ADD_ROUND(addr, PUD_SIZE);
+                        if(last > end)
+                                last = end;
+                        if(pud_newpage(*pud)){
+                                updated = 1;
+                                err = os_unmap_memory((void *) addr,
+                                                      last - addr);
+                                if(err < 0)
+                                        panic("munmap failed, errno = %d\n",
+                                              -err);
+                        }
+                        addr = last;
+                        continue;
+                }
+
+                pmd = pmd_offset(pud, addr);
+                if(!pmd_present(*pmd)){
+                        last = ADD_ROUND(addr, PMD_SIZE);
+                        if(last > end)
+                                last = end;
+                        if(pmd_newpage(*pmd)){
+                                updated = 1;
+                                err = os_unmap_memory((void *) addr,
+                                                      last - addr);
+                                if(err < 0)
+                                        panic("munmap failed, errno = %d\n",
+                                              -err);
+                        }
+                        addr = last;
+                        continue;
+                }
+
+                pte = pte_offset_kernel(pmd, addr);
+                if(!pte_present(*pte) || pte_newpage(*pte)){
+                        updated = 1;
+                        err = os_unmap_memory((void *) addr,
+                                              PAGE_SIZE);
+                        if(err < 0)
+                                panic("munmap failed, errno = %d\n",
+                                      -err);
+                        if(pte_present(*pte))
+                                map_memory(addr,
+                                           pte_val(*pte) & PAGE_MASK,
+                                           PAGE_SIZE, 1, 1, 1);
+                }
+                else if(pte_newprot(*pte)){
+                        updated = 1;
+                        protect_memory(addr, PAGE_SIZE, 1, 1, 1, 1);
+                }
+                addr += PAGE_SIZE;
+        }
+        return(updated);
+}
+
+void flush_tlb_page(struct vm_area_struct *vma, unsigned long address)
+{
+        address &= PAGE_MASK;
+        flush_tlb_range(vma, address, address + PAGE_SIZE);
+}
+
+void flush_tlb_all(void)
+{
+        flush_tlb_mm(current->mm);
+}
+  
+void flush_tlb_kernel_range(unsigned long start, unsigned long end)
+{
+        CHOOSE_MODE_PROC(flush_tlb_kernel_range_tt,
+                         flush_tlb_kernel_range_common, start, end);
+}
+
+void flush_tlb_kernel_vm(void)
+{
+        CHOOSE_MODE(flush_tlb_kernel_vm_tt(),
+                    flush_tlb_kernel_range_common(start_vm, end_vm));
+}
+
+void __flush_tlb_one(unsigned long addr)
+{
+        CHOOSE_MODE_PROC(__flush_tlb_one_tt, __flush_tlb_one_skas, addr);
+}
+
+void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, 
+     unsigned long end)
+{
+        CHOOSE_MODE_PROC(flush_tlb_range_tt, flush_tlb_range_skas, vma, start,
+                         end);
+}
+
+void flush_tlb_mm(struct mm_struct *mm)
+{
+        CHOOSE_MODE_PROC(flush_tlb_mm_tt, flush_tlb_mm_skas, mm);
+}
+
+void force_flush_all(void)
+{
+        CHOOSE_MODE(force_flush_all_tt(), force_flush_all_skas());
+}
+
+pgd_t *pgd_offset_proc(struct mm_struct *mm, unsigned long address)
+{
+        return(pgd_offset(mm, address));
+}
+
+pud_t *pud_offset_proc(pgd_t *pgd, unsigned long address)
+{
+        return(pud_offset(pgd, address));
+}
+
+pmd_t *pmd_offset_proc(pud_t *pud, unsigned long address)
+{
+        return(pmd_offset(pud, address));
+}
+
+pte_t *pte_offset_proc(pmd_t *pmd, unsigned long address)
+{
+        return(pte_offset_kernel(pmd, address));
+}
+
+pte_t *addr_pte(struct task_struct *task, unsigned long addr)
+{
+        pgd_t *pgd = pgd_offset(task->mm, addr);
+        pud_t *pud = pud_offset(pgd, addr);
+        pmd_t *pmd = pmd_offset(pud, addr);
+
+        return(pte_offset_map(pmd, addr));
+}
+
+int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,
+     int r, int w, int x, struct host_vm_op *ops, int index,
+     int last_filled, int data,
+     void (*do_ops)(int, struct host_vm_op *, int))
+{
+        __u64 offset;
+	struct host_vm_op *last;
+	int fd;
+
+	fd = phys_mapping(phys, &offset);
+	if(index != -1){
+		last = &ops[index];
+		if((last->type == MMAP) &&
+		   (last->u.mmap.addr + last->u.mmap.len == virt) &&
+		   (last->u.mmap.r == r) && (last->u.mmap.w == w) &&
+		   (last->u.mmap.x == x) && (last->u.mmap.fd == fd) &&
+		   (last->u.mmap.offset + last->u.mmap.len == offset)){
+			last->u.mmap.len += len;
+			return(index);
+		}
+	}
+
+	if(index == last_filled){
+		(*do_ops)(data, ops, last_filled);
+		index = -1;
+	}
+
+	ops[++index] = ((struct host_vm_op) { .type	= MMAP,
+					      .u = { .mmap = {
+						      .addr	= virt,
+						      .len	= len,
+						      .r	= r,
+						      .w	= w,
+						      .x	= x,
+						      .fd	= fd,
+						      .offset	= offset }
+					      } });
+	return(index);
+}
+
+int add_munmap(unsigned long addr, unsigned long len, struct host_vm_op *ops,
+	       int index, int last_filled, int data,
+	       void (*do_ops)(int, struct host_vm_op *, int))
+{
+	struct host_vm_op *last;
+
+	if(index != -1){
+		last = &ops[index];
+		if((last->type == MUNMAP) &&
+		   (last->u.munmap.addr + last->u.mmap.len == addr)){
+			last->u.munmap.len += len;
+			return(index);
+		}
+	}
+
+	if(index == last_filled){
+		(*do_ops)(data, ops, last_filled);
+		index = -1;
+	}
+
+	ops[++index] = ((struct host_vm_op) { .type	= MUNMAP,
+					      .u = { .munmap = {
+						      .addr	= addr,
+						      .len	= len } } });
+	return(index);
+}
+
+int add_mprotect(unsigned long addr, unsigned long len, int r, int w, int x,
+		 struct host_vm_op *ops, int index, int last_filled, int data,
+		 void (*do_ops)(int, struct host_vm_op *, int))
+{
+	struct host_vm_op *last;
+
+	if(index != -1){
+		last = &ops[index];
+		if((last->type == MPROTECT) &&
+		   (last->u.mprotect.addr + last->u.mprotect.len == addr) &&
+		   (last->u.mprotect.r == r) && (last->u.mprotect.w == w) &&
+		   (last->u.mprotect.x == x)){
+			last->u.mprotect.len += len;
+			return(index);
+		}
+	}
+
+	if(index == last_filled){
+		(*do_ops)(data, ops, last_filled);
+		index = -1;
+	}
+
+	ops[++index] = ((struct host_vm_op) { .type	= MPROTECT,
+					      .u = { .mprotect = {
+						      .addr	= addr,
+						      .len	= len,
+						      .r	= r,
+						      .w	= w,
+						      .x	= x } } });
+	return(index);
+}