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add nocache for mmap. usage: void *va = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS | 0x40, -1, 0);

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This commit is contained in:
simin
2012-11-11 22:31:32 +09:00
committed by Masamichi Takagi m-takagi@ab.jp.nec.com
parent 06003ec2e2
commit 31098d3d75
3 changed files with 113 additions and 7 deletions
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87
kernel/process.c
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@@ -9,7 +9,7 @@
#include <auxvec.h>
#include <timer.h>
#define DEBUG_PRINT_PROCESS
//#define DEBUG_PRINT_PROCESS
#ifdef DEBUG_PRINT_PROCESS
#define dkprintf kprintf
@@ -353,6 +353,91 @@ unsigned long extend_process_region(struct process *proc,
return address;
}
#ifdef USE_NOCACHE_MMAP
unsigned long extend_process_nocache_region(struct process *proc,
unsigned long start, unsigned long end,
unsigned long address)
{
unsigned long aligned_end, aligned_new_end;
void *p;
if (!address || address < start || address >= USER_END) {
return end;
}
aligned_end = ((end + PAGE_SIZE - 1) & PAGE_MASK);
if (aligned_end >= address) {
return address;
}
aligned_new_end = (address + PAGE_SIZE - 1) & PAGE_MASK;
#ifdef USE_LARGE_PAGES
if (aligned_new_end - aligned_end >= LARGE_PAGE_SIZE) {
unsigned long p_aligned;
unsigned long old_aligned_end = aligned_end;
if ((aligned_end & (LARGE_PAGE_SIZE - 1)) != 0) {
aligned_end = (aligned_end + (LARGE_PAGE_SIZE - 1)) & LARGE_PAGE_MASK;
/* Fill in the gap between old_aligned_end and aligned_end
* with regular pages */
p = allocate_pages((aligned_end - old_aligned_end) >> PAGE_SHIFT, 0);
add_process_memory_range(proc, old_aligned_end, aligned_end,
virt_to_phys(p), 0);
dkprintf("filled in gap for LARGE_PAGE_SIZE aligned start: 0x%lX -> 0x%lX\n",
old_aligned_end, aligned_end);
}
/* Add large region for the actual mapping */
aligned_new_end = (aligned_new_end + (aligned_end - old_aligned_end) +
(LARGE_PAGE_SIZE - 1)) & LARGE_PAGE_MASK;
address = aligned_new_end;
p = allocate_pages((aligned_new_end - aligned_end + LARGE_PAGE_SIZE)
>> PAGE_SHIFT, 0);
p_aligned = ((unsigned long)p + (LARGE_PAGE_SIZE - 1)) & LARGE_PAGE_MASK;
if (p_aligned > (unsigned long)p) {
free_pages(p, (p_aligned - (unsigned long)p) >> PAGE_SHIFT);
}
add_process_memory_range(proc, aligned_end, aligned_new_end,
virt_to_phys((void *)p_aligned), VR_IO_NOCACHE);
dkprintf("largePTE area(no cache): 0x%lX - 0x%lX (s: %lu) -> 0x%lX - \n",
aligned_end, aligned_new_end,
(aligned_new_end - aligned_end),
virt_to_phys((void *)p_aligned));
return address;
}
#endif
p = allocate_pages((aligned_new_end - aligned_end) >> PAGE_SHIFT, 0);
// kprintf("process.c,p=%lx\n", p);
if (!p) {
// kprintf("process.c,p==0\n");
return end;
}
add_process_memory_range(proc, aligned_end, aligned_new_end,
virt_to_phys(p), VR_IO_NOCACHE);
dkprintf("extend area(no cache): 0x%lX - 0x%lX (s: %lu) -> 0x%lX - \n",
aligned_end, aligned_new_end,
(aligned_new_end - aligned_end),
virt_to_phys(p));
return address;
}
#endif
// Original version retained because dcfa (src/mccmd/client/ibmic/main.c) calls this
int remove_process_region(struct process *proc,
unsigned long start, unsigned long end)
{