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| author | Kumar Gala <galak@kernel.crashing.org> | 2008-04-28 02:24:04 -0500 |
|---|---|---|
| committer | Andrew Fleming-AFLEMING <afleming@freescale.com> | 2008-04-29 09:42:19 -0500 |
| commit | cf6cc014270549684873a5972d2595052c468cb6 (patch) | |
| tree | 45f654136fdd2a3aa27de90ad838194fa28042f0 | |
| parent | fd2d2d1025b3cafa1d5846c4e4a8cda63b539160 (diff) | |
| download | u-boot-cf6cc014270549684873a5972d2595052c468cb6.tar.gz u-boot-cf6cc014270549684873a5972d2595052c468cb6.tar.bz2 u-boot-cf6cc014270549684873a5972d2595052c468cb6.zip | |
85xx: Additional fixes and cleanup of MP code
* adjust __spin_table alignment to match ePAPR v0.94 spec
* loop over all cpus when determing who is up. This fixes an issue if
the "boot cpu" isn't core0. The "boot cpu" will already be in the
cpu_up_mask so there is no harm
* Added some protection in the code to ensure proper behavior. These
changes are explicitly needed but don't hurt:
- Added eieio to ensure the "hot word" of the table is written after
all other table updates have occurred.
- Added isync to ensure we don't prefetch loading of table entries
until we a released
These issues we raised by Dave Liu.
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
| -rw-r--r-- | cpu/mpc85xx/mp.c | 6 | ||||
| -rw-r--r-- | cpu/mpc85xx/release.S | 3 |
2 files changed, 7 insertions, 2 deletions
diff --git a/cpu/mpc85xx/mp.c b/cpu/mpc85xx/mp.c index e733f7b00a..a527cf3047 100644 --- a/cpu/mpc85xx/mp.c +++ b/cpu/mpc85xx/mp.c @@ -103,6 +103,10 @@ int cpu_release(int nr, int argc, char *argv[]) } table[BOOT_ENTRY_ADDR_UPPER] = (u32)(boot_addr >> 32); + + /* ensure all table updates complete before final address write */ + eieio(); + table[BOOT_ENTRY_ADDR_LOWER] = (u32)(boot_addr & 0xffffffff); return 0; @@ -153,7 +157,7 @@ static void pq3_mp_up(unsigned long bootpg) /* wait for everyone */ while (timeout) { int i; - for (i = 1; i < CONFIG_NR_CPUS; i++) { + for (i = 0; i < CONFIG_NR_CPUS; i++) { if (table[i * NUM_BOOT_ENTRY + BOOT_ENTRY_ADDR_LOWER]) cpu_up_mask |= (1 << i); }; diff --git a/cpu/mpc85xx/release.S b/cpu/mpc85xx/release.S index 3b7366ff69..a47edaea62 100644 --- a/cpu/mpc85xx/release.S +++ b/cpu/mpc85xx/release.S @@ -114,6 +114,7 @@ __secondary_start_page: lwz r4,ENTRY_ADDR_LOWER(r10) andi. r11,r4,1 bne 2b + isync /* get the upper bits of the addr */ lwz r11,ENTRY_ADDR_UPPER(r10) @@ -169,7 +170,7 @@ __secondary_start_page: mtspr SPRN_SRR1,r13 rfi - .align 3 + .align L1_CACHE_SHIFT .globl __spin_table __spin_table: .space CONFIG_NR_CPUS*ENTRY_SIZE |