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 Post subject: How to use cache(如何使用cache)
PostPosted: Thu Dec 20, 2012 6:15 pm 
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Joined: Fri Mar 04, 2011 9:36 pm
Posts: 500
cache的使用方法
1. 先設定地址為cacheable。請看暫存器$mr0的說明。
2. 將cache enable,請看暫存器$mr8的說明。

請參考demo-cache這個example code,看main-cache.c。

1. 將NTC0設為2,即Cacheable/Write-Back
/* Cacheable/Write-Back for NTC0 */
mmu_ctl = __nds32__mfsr(NDS32_SR_MMU_CTL);
mmu_ctl |= 0x2 << 1;
__nds32__mtsr(mmu_ctl, NDS32_SR_MMU_CTL);

2.
Enable i-cache
cache_ctl = __nds32__mfsr(NDS32_SR_CACHE_CTL);
cache_ctl |= 0x1;
/* Enable I Cache */
__nds32__mtsr(cache_ctl, NDS32_SR_CACHE_CTL);

Enable d-cache
cache_ctl = __nds32__mfsr(NDS32_SR_CACHE_CTL);
cache_ctl |= 0x2;
/* Enable D Cache */
__nds32__mtsr(cache_ctl, NDS32_SR_CACHE_CTL);


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