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arm64: Update memcpy_{from, to}io() helpers
At early U-Boot stage, before relocation, MMU is not yet configured and disabled. DDR may not be configured with the correct memory attributes (can be configured in MT_DEVICE instead of MT_MEMORY). In this case, usage of memcpy_{from, to}io() may leads to synchronous abort in AARCH64 in case the normal memory address is not 64Bits aligned. To avoid such situation, forbid usage of normal memory cast to (u64 *) in case MMU is not enabled. Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com> Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com> Cc: mark.kettenis@xs4all.nl Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
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parent
558e699d15
commit
268f6ac1f9
3 changed files with 26 additions and 10 deletions
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@ -719,6 +719,11 @@ int icache_status(void)
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return (get_sctlr() & CR_I) != 0;
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}
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int mmu_status(void)
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{
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return (get_sctlr() & CR_M) != 0;
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}
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void invalidate_icache_all(void)
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{
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__asm_invalidate_icache_all();
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@ -740,6 +745,11 @@ int icache_status(void)
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return 0;
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}
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int mmu_status(void)
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{
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return 0;
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}
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void invalidate_icache_all(void)
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{
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}
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@ -338,6 +338,7 @@ extern void __readwrite_bug(const char *fn);
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/* Optimized copy functions to read from/write to IO sapce */
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#ifdef CONFIG_ARM64
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#include <cpu_func.h>
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/*
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* Copy data from IO memory space to "real" memory space.
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*/
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@ -351,11 +352,13 @@ void __memcpy_fromio(void *to, const volatile void __iomem *from, size_t count)
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count--;
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}
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while (count >= 8) {
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*(u64 *)to = __raw_readq(from);
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from += 8;
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to += 8;
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count -= 8;
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if (mmu_status()) {
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while (count >= 8) {
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*(u64 *)to = __raw_readq(from);
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from += 8;
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to += 8;
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count -= 8;
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}
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}
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while (count) {
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@ -379,11 +382,13 @@ void __memcpy_toio(volatile void __iomem *to, const void *from, size_t count)
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count--;
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}
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while (count >= 8) {
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__raw_writeq(*(u64 *)from, to);
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from += 8;
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to += 8;
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count -= 8;
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if (mmu_status()) {
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while (count >= 8) {
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__raw_writeq(*(u64 *)from, to);
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from += 8;
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to += 8;
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count -= 8;
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}
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}
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while (count) {
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@ -59,6 +59,7 @@ int dcache_status(void);
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void dcache_enable(void);
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void dcache_disable(void);
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void mmu_disable(void);
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int mmu_status(void);
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/* arch/$(ARCH)/lib/cache.c */
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void enable_caches(void);
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