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tree revision 939:6f2302afeb89 lxdream-mem
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filename src/mem.c
changeset 939:6f2302afeb89
prev934:3acd3b3ee6d1
next946:d41ee7994db7
author nkeynes
date Sat Jan 03 03:30:26 2009 +0000 (15 years ago)
branchlxdream-mem
permissions -rw-r--r--
last change MMU work-in-progress
* Move SDRAM out into separate sdram.c
* Move all page-table management into mmu.c
* Convert UTLB management to use the new page-tables
* Rip out all calls to mmu_vma_to_phys_* and replace with direct access
file annotate diff log raw 
     1.1 --- a/src/mem.c	Fri Dec 26 14:25:23 2008 +0000

     1.2 +++ b/src/mem.c	Sat Jan 03 03:30:26 2009 +0000

     1.3 @@ -35,6 +35,10 @@

     1.4  #include "mmio.h"

     1.5  #include "dreamcast.h"

     1.6  

     1.7 +#ifndef PAGE_SIZE

     1.8 +#define PAGE_SIZE 4096

     1.9 +#endif

    1.10 +

    1.11  sh4ptr_t *page_map = NULL;

    1.12  mem_region_fn_t *ext_address_space = NULL;

    1.13  

    1.14 @@ -91,6 +95,18 @@

    1.15      return mem;

    1.16  }

    1.17  

    1.18 +void mem_unprotect( void *region, uint32_t size )

    1.19 +{

    1.20 +    /* Force page alignment */

    1.21 +    uintptr_t i = (uintptr_t)region;

    1.22 +    uintptr_t mask = ~(PAGE_SIZE-1);

    1.23 +    void *ptr = (void *)(i & mask);

    1.24 +    size_t len = i & (PAGE_SIZE-1) + size;

    1.25 +    len = (len + (PAGE_SIZE-1)) & mask;

    1.26 +    

    1.27 +    int status = mprotect( ptr, len, PROT_READ|PROT_WRITE|PROT_EXEC );

    1.28 +    assert( status == 0 );

    1.29 +}

    1.30  

    1.31  void mem_init( void )

    1.32  {
.