diff options
| author | Edgar E. Iglesias <edgar.iglesias@xilinx.com> | 2015-10-26 14:01:58 +0100 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2015-10-27 15:59:46 +0000 |
| commit | 4ca6a051758edf625a17dfc4ce4ab72edabac170 (patch) | |
| tree | 244755c886bc97a2a62e184ae3b83758d7ba0cfe /target-arm/helper.c | |
| parent | 4ee38098010240e0b390061fdd0151ff62d80279 (diff) | |
target-arm: lpae: Replace tsz with computed inputsize
Remove the tsz variable and introduce inputsize.
This simplifies the code a little and makes it easier to
compare with the reference manuals.
No functional change.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Message-id: 1445864527-14520-6-git-send-email-edgar.iglesias@gmail.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'target-arm/helper.c')
| -rw-r--r-- | target-arm/helper.c | 22 |
1 files changed, 11 insertions, 11 deletions
diff --git a/target-arm/helper.c b/target-arm/helper.c index d2f035f984..982d8306d7 100644 --- a/target-arm/helper.c +++ b/target-arm/helper.c @@ -6481,7 +6481,6 @@ static bool get_phys_addr_lpae(CPUARMState *env, target_ulong address, uint32_t level = 1; uint32_t epd = 0; int32_t t0sz, t1sz; - int32_t tsz; uint32_t tg; uint64_t ttbr; int ttbr_select; @@ -6491,6 +6490,7 @@ static bool get_phys_addr_lpae(CPUARMState *env, target_ulong address, uint32_t attrs; int32_t granule_sz = 9; int32_t va_size = 32; + int inputsize; int32_t tbi = 0; TCR *tcr = regime_tcr(env, mmu_idx); int ap, ns, xn, pxn; @@ -6593,7 +6593,7 @@ static bool get_phys_addr_lpae(CPUARMState *env, target_ulong address, if (el < 2) { epd = extract32(tcr->raw_tcr, 7, 1); } - tsz = t0sz; + inputsize = va_size - t0sz; tg = extract32(tcr->raw_tcr, 14, 2); if (tg == 1) { /* 64KB pages */ @@ -6608,7 +6608,7 @@ static bool get_phys_addr_lpae(CPUARMState *env, target_ulong address, ttbr = regime_ttbr(env, mmu_idx, 1); epd = extract32(tcr->raw_tcr, 23, 1); - tsz = t1sz; + inputsize = va_size - t1sz; tg = extract32(tcr->raw_tcr, 30, 2); if (tg == 3) { /* 64KB pages */ @@ -6620,7 +6620,7 @@ static bool get_phys_addr_lpae(CPUARMState *env, target_ulong address, } /* Here we should have set up all the parameters for the translation: - * va_size, ttbr, epd, tsz, granule_sz, tbi + * va_size, inputsize, ttbr, epd, granule_sz, tbi */ if (epd) { @@ -6635,27 +6635,27 @@ static bool get_phys_addr_lpae(CPUARMState *env, target_ulong address, * of strides (granule_sz bits at a time) needed to consume the bits * of the input address. In the pseudocode this is: * level = 4 - RoundUp((inputsize - grainsize) / stride) - * where their 'inputsize' is our 'va_size - tsz', 'grainsize' is + * where their 'inputsize' is our 'inputsize', 'grainsize' is * our 'granule_sz + 3' and 'stride' is our 'granule_sz'. * Applying the usual "rounded up m/n is (m+n-1)/n" and simplifying: - * = 4 - (va_size - tsz - granule_sz - 3 + granule_sz - 1) / granule_sz - * = 4 - (va_size - tsz - 4) / granule_sz; + * = 4 - (inputsize - granule_sz - 3 + granule_sz - 1) / granule_sz + * = 4 - (inputsize - 4) / granule_sz; */ - level = 4 - (va_size - tsz - 4) / granule_sz; + level = 4 - (inputsize - 4) / granule_sz; /* Clear the vaddr bits which aren't part of the within-region address, * so that we don't have to special case things when calculating the * first descriptor address. */ - if (tsz) { - address &= (1ULL << (va_size - tsz)) - 1; + if (va_size != inputsize) { + address &= (1ULL << inputsize) - 1; } descmask = (1ULL << (granule_sz + 3)) - 1; /* Now we can extract the actual base address from the TTBR */ descaddr = extract64(ttbr, 0, 48); - descaddr &= ~((1ULL << (va_size - tsz - (granule_sz * (4 - level)))) - 1); + descaddr &= ~((1ULL << (inputsize - (granule_sz * (4 - level)))) - 1); /* Secure accesses start with the page table in secure memory and * can be downgraded to non-secure at any step. Non-secure accesses |