From c2287af1552bd630956568d3957c370f86801b7d Mon Sep 17 00:00:00 2001 From: Kumar Gala Date: Thu, 3 Sep 2009 08:20:24 -0500 Subject: ppc/85xx: Add a simple function to search the TLB Allow us to search the TLB array based on an address. This is useful if we want to change an entry but dont know where it happens to be located. For example, the boot page mapping we use on MP or the flash TLB that we change the WIMGE settings for after we've relocated. Signed-off-by: Kumar Gala --- cpu/mpc85xx/tlb.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) (limited to 'cpu') diff --git a/cpu/mpc85xx/tlb.c b/cpu/mpc85xx/tlb.c index f3d3080..0497a29 100644 --- a/cpu/mpc85xx/tlb.c +++ b/cpu/mpc85xx/tlb.c @@ -106,6 +106,33 @@ void init_tlbs(void) return ; } +static void tlbsx (const volatile unsigned *addr) +{ + __asm__ __volatile__ ("tlbsx 0,%0" : : "r" (addr), "m" (*addr)); +} + +/* return -1 if we didn't find anything */ +int find_tlb_idx(void *addr, u8 tlbsel) +{ + u32 _mas0, _mas1; + + /* zero out Search PID, AS */ + mtspr(MAS6, 0); + + tlbsx(addr); + + _mas0 = mfspr(MAS0); + _mas1 = mfspr(MAS1); + + /* we found something, and its in the TLB we expect */ + if ((MAS1_VALID & _mas1) && + (MAS0_TLBSEL(tlbsel) == (_mas0 & MAS0_TLBSEL_MSK))) { + return ((_mas0 & MAS0_ESEL_MSK) >> 16); + } + + return -1; +} + #ifdef CONFIG_ADDR_MAP void init_addr_map(void) { -- cgit v1.1