From mboxrd@z Thu Jan 1 00:00:00 1970 From: Shinya Kuribayashi Date: Wed, 19 Mar 2008 03:22:53 +0900 Subject: [U-Boot-Users] [MIPS] Implement flush_cache() In-Reply-To: References: <47DFF0DB.5030003@ruby.dti.ne.jp> Message-ID: <47E0087D.1030009@ruby.dti.ne.jp> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Andrew Dyer wrote: > looking at how cache_flush() is used (see common/cmd_load.c, > common/cmd_elf.c, etc), I believe this loop should also do a cache_op > with Hit_Invalidate_I to invalidate the icache. > > seems like it would be easier to read if the condition was included in > the while() statement Hm, then is this ok? diff --git a/cpu/mips/cpu.c b/cpu/mips/cpu.c index 7559ac6..e59c9c9 100644 --- a/cpu/mips/cpu.c +++ b/cpu/mips/cpu.c @@ -25,6 +25,17 @@ #include #include #include +#include + +#define cache_op(op,addr) \ + __asm__ __volatile__( \ + " .set push \n" \ + " .set noreorder \n" \ + " .set mips3\n\t \n" \ + " cache %0, %1 \n" \ + " .set pop \n" \ + : \ + : "i" (op), "R" (*(unsigned char *)(addr))) int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) { @@ -41,6 +52,17 @@ int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) void flush_cache(ulong start_addr, ulong size) { + unsigned long lsize = CFG_DCACHE_SIZE; + unsigned long addr = start_addr & ~(lsize - 1); + unsigned long aend = (start_addr + size - 1) & ~(lsize - 1); + + while (1) { + cache_op(Hit_Writeback_Inv_D, start_addr); + cache_op(Hit_Invalidate_I, start_addr); + if (addr == aend) + break; + addr += lsize; + } } void write_one_tlb(int index, u32 pagemask, u32 hi, u32 low0, u32 low1)