[Xen-changelog] [xen staging] xen/arm64: Add generic assembly macros

[patchbot@xxxxxxx]

commit bb2e9fc7df592753e1fd73b4fec21c375cd3e2e1
Author:     Julien Grall <julien.grall@xxxxxxx>
AuthorDate: Tue Jun 12 12:36:39 2018 +0100
Commit:     Julien Grall <julien.grall@xxxxxxx>
CommitDate: Fri Jun 22 02:59:43 2018 +0100

    xen/arm64: Add generic assembly macros
    
    Add assembly macros to simplify assembly code:
        - adr_cpu_info: Get the address to the current cpu_info structure
        - ldr_this_cpu: Load a per-cpu value
    
    This is part of XSA-263.
    
    Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
    Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
 xen/include/asm-arm/arm64/macros.h | 25 +++++++++++++++++++++++++
 xen/include/asm-arm/macros.h       |  2 +-
 2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/xen/include/asm-arm/arm64/macros.h 
b/xen/include/asm-arm/arm64/macros.h
new file mode 100644
index 0000000000..9c5e676b37
--- /dev/null
+++ b/xen/include/asm-arm/arm64/macros.h
@@ -0,0 +1,25 @@
+#ifndef __ASM_ARM_ARM64_MACROS_H
+#define __ASM_ARM_ARM64_MACROS_H
+
+    /*
+     * @dst: Result of get_cpu_info()
+     */
+    .macro  adr_cpu_info, dst
+    add     \dst, sp, #STACK_SIZE
+    and     \dst, \dst, #~(STACK_SIZE - 1)
+    sub     \dst, \dst, #CPUINFO_sizeof
+    .endm
+
+    /*
+     * @dst: Result of READ_ONCE(per_cpu(sym, smp_processor_id()))
+     * @sym: The name of the per-cpu variable
+     * @tmp: scratch register
+     */
+    .macro  ldr_this_cpu, dst, sym, tmp
+    ldr     \dst, =per_cpu__\sym
+    mrs     \tmp, tpidr_el2
+    ldr     \dst, [\dst, \tmp]
+    .endm
+
+#endif /* __ASM_ARM_ARM64_MACROS_H */
+
diff --git a/xen/include/asm-arm/macros.h b/xen/include/asm-arm/macros.h
index 5d837cb38b..1d4bb41d15 100644
--- a/xen/include/asm-arm/macros.h
+++ b/xen/include/asm-arm/macros.h
@@ -8,7 +8,7 @@
 #if defined (CONFIG_ARM_32)
 # include <asm/arm32/macros.h>
 #elif defined(CONFIG_ARM_64)
-/* No specific ARM64 macros for now */
+# include <asm/arm64/macros.h>
 #else
 # error "unknown ARM variant"
 #endif
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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