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authorRichard Henderson <rth@twiddle.net>2016-09-03 11:32:35 -0700
committerRichard Henderson <rth@twiddle.net>2016-10-26 08:29:02 -0700
commit6a73ecf5cfcd39b7afb5d6a24174730eac49d4b5 (patch)
treeaea605ed47f998cda117cc02659475b6e1c77cee /target-alpha/cpu.h
parent05188cc72f0399e99c92f608a8e7ca4c8e552c4b (diff)
downloadqemu-arm-6a73ecf5cfcd39b7afb5d6a24174730eac49d4b5.tar.gz
target-alpha: Introduce MMU_PHYS_IDX
Rather than using helpers for physical accesses, use a mmu index. The primary cleanup is with store-conditional on physical addresses. Signed-off-by: Richard Henderson <rth@twiddle.net>
Diffstat (limited to 'target-alpha/cpu.h')
-rw-r--r--target-alpha/cpu.h18
1 files changed, 7 insertions, 11 deletions
diff --git a/target-alpha/cpu.h b/target-alpha/cpu.h
index dcdd0416bd..871d9baa35 100644
--- a/target-alpha/cpu.h
+++ b/target-alpha/cpu.h
@@ -201,7 +201,7 @@ enum {
/* MMU modes definitions */
-/* Alpha has 5 MMU modes: PALcode, kernel, executive, supervisor, and user.
+/* Alpha has 5 MMU modes: PALcode, Kernel, Executive, Supervisor, and User.
The Unix PALcode only exposes the kernel and user modes; presumably
executive and supervisor are used by VMS.
@@ -209,22 +209,18 @@ enum {
there are PALmode instructions that can access data via physical mode
or via an os-installed "alternate mode", which is one of the 4 above.
- QEMU does not currently properly distinguish between code/data when
- looking up addresses. To avoid having to address this issue, our
- emulated PALcode will cheat and use the KSEG mapping for its code+data
- rather than physical addresses.
+ That said, we're only emulating Unix PALcode, and not attempting VMS,
+ so we don't need to implement Executive and Supervisor. QEMU's own
+ PALcode cheats and usees the KSEG mapping for its code+data rather than
+ physical addresses. */
- Moreover, we're only emulating Unix PALcode, and not attempting VMS.
-
- All of which allows us to drop all but kernel and user modes.
- Elide the unused MMU modes to save space. */
-
-#define NB_MMU_MODES 2
+#define NB_MMU_MODES 3
#define MMU_MODE0_SUFFIX _kernel
#define MMU_MODE1_SUFFIX _user
#define MMU_KERNEL_IDX 0
#define MMU_USER_IDX 1
+#define MMU_PHYS_IDX 2
typedef struct CPUAlphaState CPUAlphaState;