[Xen-devel] [PATCH v4 05/10] acpi: Refactor acpi_os_map_memory to be architecturally independent

[Shannon Zhao <zhaoshenglong@xxxxxxxxxx>]

From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>

Current acpi_os_map_memory is specific to x86. Refactor it to be
architecturally independent.

Cc: Jan Beulich <jbeulich@xxxxxxxx>
Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
Acked-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
 xen/arch/x86/acpi/lib.c | 16 ++++++++++++++++
 xen/drivers/acpi/osl.c  | 12 +-----------
 xen/include/xen/acpi.h  |  2 ++
 3 files changed, 19 insertions(+), 11 deletions(-)

diff --git a/xen/arch/x86/acpi/lib.c b/xen/arch/x86/acpi/lib.c
index cc15ea3..1e2e124 100644
--- a/xen/arch/x86/acpi/lib.c
+++ b/xen/arch/x86/acpi/lib.c
@@ -33,6 +33,22 @@ u8 __read_mostly acpi_disable_value;
 u32 __read_mostly x86_acpiid_to_apicid[MAX_MADT_ENTRIES] =
     {[0 ... MAX_MADT_ENTRIES - 1] = BAD_APICID };
 
+void __iomem *
+arch_acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
+{
+       if (system_state >= SYS_STATE_active) {
+               mfn_t mfn = _mfn(PFN_DOWN(phys));
+               unsigned int offs = phys & (PAGE_SIZE - 1);
+
+               /* The low first Mb is always mapped. */
+               if ( !((phys + size - 1) >> 20) )
+                       return __va(phys);
+               return __vmap(&mfn, PFN_UP(offs + size), 1, 1,
+                             PAGE_HYPERVISOR_NOCACHE) + offs;
+       }
+       return __acpi_map_table(phys, size);
+}
+
 /*
  * Important Safety Note:  The fixed ACPI page numbers are *subtracted*
  * from the fixed base.  That's why we start at FIX_ACPI_END and
diff --git a/xen/drivers/acpi/osl.c b/xen/drivers/acpi/osl.c
index ce15470..dc971af 100644
--- a/xen/drivers/acpi/osl.c
+++ b/xen/drivers/acpi/osl.c
@@ -86,17 +86,7 @@ acpi_physical_address __init acpi_os_get_root_pointer(void)
 void __iomem *
 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 {
-       if (system_state >= SYS_STATE_active) {
-               mfn_t mfn = _mfn(PFN_DOWN(phys));
-               unsigned int offs = phys & (PAGE_SIZE - 1);
-
-               /* The low first Mb is always mapped. */
-               if ( !((phys + size - 1) >> 20) )
-                       return __va(phys);
-               return __vmap(&mfn, PFN_UP(offs + size), 1, 1,
-                             PAGE_HYPERVISOR_NOCACHE) + offs;
-       }
-       return __acpi_map_table(phys, size);
+       return arch_acpi_os_map_memory(phys, size);
 }
 
 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
diff --git a/xen/include/xen/acpi.h b/xen/include/xen/acpi.h
index 65e53a6..9d90d6b 100644
--- a/xen/include/xen/acpi.h
+++ b/xen/include/xen/acpi.h
@@ -54,6 +54,8 @@ typedef int (*acpi_table_handler) (struct acpi_table_header 
*table);
 
 typedef int (*acpi_table_entry_handler) (struct acpi_subtable_header *header, 
const unsigned long end);
 
+void __iomem *
+arch_acpi_os_map_memory(acpi_physical_address phys, acpi_size size);
 unsigned int acpi_get_processor_id (unsigned int cpu);
 char * __acpi_map_table (paddr_t phys_addr, unsigned long size);
 int acpi_boot_init (void);
-- 
2.0.4



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