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keep static code gen buffer for user mode - mark user mode reserved pages after all big allocations 

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4611 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2008-05-29 09:35:57 +00:00
parent fbb4a2e371
commit 4369415f1e
1 changed files with 29 additions and 5 deletions
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34
exec.c
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@ -187,14 +187,15 @@ static void map_exec(void *addr, long size)
#else
static void map_exec(void *addr, long size)
{
unsigned long start, end;
unsigned long start, end, page_size;
page_size = getpagesize();
start = (unsigned long)addr;
start &= ~(qemu_real_host_page_size - 1);
start &= ~(page_size - 1);
end = (unsigned long)addr + size;
end += qemu_real_host_page_size - 1;
end &= ~(qemu_real_host_page_size - 1);
end += page_size - 1;
end &= ~(page_size - 1);
mprotect((void *)start, end - start,
PROT_READ | PROT_WRITE | PROT_EXEC);
@ -326,12 +327,34 @@ static void tlb_unprotect_code_phys(CPUState *env, ram_addr_t ram_addr,
target_ulong vaddr);
#endif
#define DEFAULT_CODE_GEN_BUFFER_SIZE (32 * 1024 * 1024)
#if defined(CONFIG_USER_ONLY)
/* Currently it is not recommanded to allocate big chunks of data in
user mode. It will change when a dedicated libc will be used */
#define USE_STATIC_CODE_GEN_BUFFER
#endif
#ifdef USE_STATIC_CODE_GEN_BUFFER
static uint8_t static_code_gen_buffer[DEFAULT_CODE_GEN_BUFFER_SIZE];
#endif
void code_gen_alloc(unsigned long tb_size)
{
#ifdef USE_STATIC_CODE_GEN_BUFFER
code_gen_buffer = static_code_gen_buffer;
code_gen_buffer_size = DEFAULT_CODE_GEN_BUFFER_SIZE;
map_exec(code_gen_buffer, code_gen_buffer_size);
#else
code_gen_buffer_size = tb_size;
if (code_gen_buffer_size == 0) {
#if defined(CONFIG_USER_ONLY)
/* in user mode, phys_ram_size is not meaningful */
code_gen_buffer_size = DEFAULT_CODE_GEN_BUFFER_SIZE;
#else
/* XXX: needs ajustments */
code_gen_buffer_size = (int)(phys_ram_size / 4);
#endif
}
if (code_gen_buffer_size < MIN_CODE_GEN_BUFFER_SIZE)
code_gen_buffer_size = MIN_CODE_GEN_BUFFER_SIZE;
@ -363,6 +386,7 @@ void code_gen_alloc(unsigned long tb_size)
}
map_exec(code_gen_buffer, code_gen_buffer_size);
#endif
#endif /* !USE_STATIC_CODE_GEN_BUFFER */
map_exec(code_gen_prologue, sizeof(code_gen_prologue));
code_gen_buffer_max_size = code_gen_buffer_size -
code_gen_max_block_size();
@ -375,10 +399,10 @@ void code_gen_alloc(unsigned long tb_size)
size. */
void cpu_exec_init_all(unsigned long tb_size)
{
page_init();
cpu_gen_init();
code_gen_alloc(tb_size);
code_gen_ptr = code_gen_buffer;
page_init();
io_mem_init();
}