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authorAli Saidi <saidi@eecs.umich.edu>2004-05-11 17:31:28 -0400
committerAli Saidi <saidi@eecs.umich.edu>2004-05-11 17:31:28 -0400
commitce9b1a1e373cf965e18ef379a121b95119ff1f46 (patch)
treeceac3b98f32f44519b26ef0534a0a333c5099946 /system/alpha/palcode
parent8283dbcf3ae6a25ba989fbd5ee92eb643afe43e6 (diff)
downloadgem5-ce9b1a1e373cf965e18ef379a121b95119ff1f46.tar.xz
added some comments to palcode and zeroed system type in HWPRB (m5 will fill in)
console/console.c: 0 the system type, let m5 overwrite palcode/platform_m5.s: add some comments and make the timer interrupt actually care what CPU it happened on
Diffstat (limited to 'system/alpha/palcode')
-rw-r--r--system/alpha/palcode/platform_m5.s24
1 files changed, 15 insertions, 9 deletions
diff --git a/system/alpha/palcode/platform_m5.s b/system/alpha/palcode/platform_m5.s
index d0e751603..2da52d847 100644
--- a/system/alpha/palcode/platform_m5.s
+++ b/system/alpha/palcode/platform_m5.s
@@ -694,13 +694,15 @@ EXPORT(sys_interrupt)
cmpeq r13, 23, r12
bne r12, sys_int_23 // Check for level 23 interrupt
+ // IPI in Tsunami
cmpeq r13, 22, r12
- bne r12, sys_int_22 // Check for level 22 interrupt (might be
- // interprocessor or timer interrupt)
+ bne r12, sys_int_22 // Check for level 22 interrupt
+ // timer interrupt
cmpeq r13, 21, r12
bne r12, sys_int_21 // Check for level 21 interrupt
+ // I/O
cmpeq r13, 20, r12
bne r12, sys_int_20 // Check for level 20 interrupt (might be corrected
@@ -753,16 +755,20 @@ sys_int_23:
ALIGN_BRANCH
sys_int_22:
- or r31,1,r16 // a0 means it is a I/O interrupt
- lda r8,0xf01(r31)
+ or r31,1,r16 // a0 means it is a clock interrupt
+ lda r8,0xf01(r31) // build up an address for the MISC register
sll r8,16,r8
- lda r8,0xa000(r8)
- sll r8,16,r8
- lda r8,0x080(r8)
- or r31,0x10,r9
+ lda r8,0xa000(r8)
+ sll r8,16,r8
+ lda r8,0x080(r8)
+
+ ldq_p r10,0(r8) // read misc register
+ and r10,0x3,r10 // isolate CPUID
+ or r31,0x10,r9 // load r9 with bit to clear
+ sll r9,r10,r9 // left shift by CPU ID
stq_p r9, 0(r8) // clear the rtc interrupt
- br r31, pal_post_interrupt //
+ br r31, pal_post_interrupt // Tell the OS
ALIGN_BRANCH