MIPS: R2: Fix problem with code that incorrectly modifies ebase.

Commit 566f74f6b2f8b85d5b8d6caaf97e5672cecd3e3e had a change that
incorrectly modified ebase. This backs out the lines that modified
ebase.
In addition, the ebase exception vector is now allocated with correct
alignment and the ebase register updated according to the architecture
specification.

Based on original patch by David VomLehn <dvomlehn@cisco.com>.

Signed-off-by: David VomLehn <dvomlehn@cisco.com>
Signed-off-by: Chris Dearman <chris@mips.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index b2d7041341b8f5afa3e313302c21b90e34e5ea3d..29fadaccecddef31d5da3ea33f819b1ad3941fe0 100644 (file)
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -1520,7 +1520,9 @@ void __cpuinit per_cpu_trap_init(void)
 #endif /* CONFIG_MIPS_MT_SMTC */
 
        if (cpu_has_veic || cpu_has_vint) {
+               unsigned long sr = set_c0_status(ST0_BEV);
                write_c0_ebase(ebase);
+               write_c0_status(sr);
                /* Setting vector spacing enables EI/VI mode  */
                change_c0_intctl(0x3e0, VECTORSPACING);
        }
@@ -1602,8 +1604,6 @@ void __cpuinit set_uncached_handler(unsigned long offset, void *addr,
 #ifdef CONFIG_64BIT
        unsigned long uncached_ebase = TO_UNCAC(ebase);
 #endif
-       if (cpu_has_mips_r2)
-               uncached_ebase += (read_c0_ebase() & 0x3ffff000);
 
        if (!addr)
                panic(panic_null_cerr);
@@ -1635,9 +1635,11 @@ void __init trap_init(void)
                return; /* Already done */
 #endif
 
-       if (cpu_has_veic || cpu_has_vint)
-               ebase = (unsigned long) alloc_bootmem_low_pages(0x200 + VECTORSPACING*64);
-       else {
+       if (cpu_has_veic || cpu_has_vint) {
+               unsigned long size = 0x200 + VECTORSPACING*64;
+               ebase = (unsigned long)
+                       __alloc_bootmem(size, 1 << fls(size), 0);
+       } else {
                ebase = CAC_BASE;
                if (cpu_has_mips_r2)
                        ebase += (read_c0_ebase() & 0x3ffff000);