Hi folks,
At present, the PAL_VM_SUMMARY call isn't implemented in
arch/ia64/kernel/hp/sim/boot/boot_head.S, so the kernel uses the
architected minimum number of bits for the virtual address space.
As one can map more than 2^50 bytes of virtual address using 64k
pages and a three-level page table, this stops the simulator from
working (it silently fails, looping on page_not_present) if 64k pages
are configured.
This patch implements PAL_VM_SUMMARY (and PAL_MEM_ATTRIB for good
measure) and pretends that the simulated machine is a McKinley.
To do the job properly, one would have to add a simulator system call
to get the real number of implemented address bits. As the simulator
is closed source, I can't do that.
Signed-off-by: Peter Chubb <[EMAIL PROTECTED]>
--- working directory: /home/peterc/kernels/linux-2.6-import/
% cg-diff |cat
diff --git a/arch/ia64/hp/sim/boot/boot_head.S
b/arch/ia64/hp/sim/boot/boot_head.S
--- a/arch/ia64/hp/sim/boot/boot_head.S
+++ b/arch/ia64/hp/sim/boot/boot_head.S
@@ -4,11 +4,12 @@
*/
#include <asm/asmmacro.h>
+#include <asm/pal.h>
.bss
.align 16
stack_mem:
.skip 16834
.text
@@ -49,7 +50,11 @@ GLOBAL_ENTRY(jmp_to_kernel)
br.sptk.few b7
END(jmp_to_kernel)
-
+/*
+ * r28 contains the index of the PAL function
+ * r29--31 the args
+ * Return values in ret0--3 (r8--11)
+ */
GLOBAL_ENTRY(pal_emulator_static)
mov r8=-1
mov r9=256
@@ -138,6 +143,17 @@ static: cmp.eq p6,p7=6,r28 /* PAL_PTCE_
st8 [r29]=r0,16 /* clear remaining bits */
st8 [r18]=r0,16 /* clear remaining bits */
;;
+1: cmp.eq p6,p7=PAL_VM_SUMMARY,r28 /* assume we're */
+(p7) br.cond.sptk.few 1f /* simulating McKinley or better */
+ mov r8=0 /* status <- 0 (success) */
+ movl r9=0x2044040020F1865 /* 50 bits phys space */
+ movl r10=0x183C /* 61 bits VA space */
+ ;;
+1: cmp.eq p6,p7=PAL_MEM_ATTRIB,r28
+(p7) br.cond.sptk.few 1f
+ mov r8=0
+ mov r9=0x80|0x01 /* WB, NatPage */
+ ;;
1: br.cond.sptk.few rp
stacked:
br.ret.sptk.few rp
-
To unsubscribe from this list: send the line "unsubscribe linux-ia64" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
