My code calls the following macro, but nothing happens.
#define invlpg_asm(pageaddr) do{\ asm volatile("invlpg %0\n\t" \
:\ :"m"(pageaddr)); \}while(0)
pageaddr is the virtual address that needs to be invalidated.
It is said that cup before i486 does not support "invlpg", how can I know the
cupmodel of my emulator.
Does my code go wrong, or the cpu of my emulator fail to support this
instruction?
--- 12年5月31日，周四, 陳韋任 (Wei-Ren Chen) <[email protected]> 写道：
发件人: 陳韋任 (Wei-Ren Chen) <[email protected]>
主题: Re: [Qemu-devel] general question
收件人: "Max Filippov" <[email protected]>
抄送: "���f任 (Wei-Ren Chen)" <[email protected]>, "吴晓琳"
<[email protected]>, [email protected]
日期: 2012年5月31日,周四,下午5:21
> Hmmm, does it?
>
> void helper_invlpg(target_ulong addr)
> {
> helper_svm_check_intercept_param(SVM_EXIT_INVLPG, 0);
> tlb_flush_page(env, addr);
> }
I would be wrong, so let the code speak. ;)
---
void tlb_flush_page(CPUArchState *env, target_ulong addr)
{
if ((addr & env->tlb_flush_mask) == env->tlb_flush_addr) {
tlb_flush(env, 1); --- (1)
return;
}
... snip ...
addr &= TARGET_PAGE_MASK;
i = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
for (mmu_idx = 0; mmu_idx < NB_MMU_MODES; mmu_idx++) {
tlb_flush_entry(&env->tlb_table[mmu_idx][i], addr);
}
tb_flush_jmp_cache(env, addr);
}
---
The comment of tlb_flush (1) says,
QEMU doesn't currently implement a global/not-global flag
for tlb entries, at the moment tlb_flush() will also flush all
tlb entries in the flush_global == false case.
That's why I get impression on QEMU flush the entire tlb. So it could flush
particular tlb entry in tlb_flush_entry?
Regards,
chenwj
--
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667
Homepage: http://people.cs.nctu.edu.tw/~chenwj
