[Xen-devel] [PATCH v2 31/41] arm : acpi estimate memory required for acpi/efi tables

[Parth Dixit <parth.dixit@xxxxxxxxxx>]

Estimate the memory required for loading acpi/efi tablee
in DOM0. Initialize the size of acpi/efi tables.

Signed-off-by: Parth Dixit <parth.dixit@xxxxxxxxxx>
---
 xen/arch/arm/domain_build.c | 54 ++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 53 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 9d98f64..f2ca525 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -69,6 +69,9 @@ struct meminfo __initdata acpi_mem;
 #ifdef CONFIG_ACPI
 /* Reserve DOM0 FDT size in ACPI case only */
 #define DOM0_FDT_MIN_SIZE 4096
+#define NR_NEW_XEN_TABLES 2
+/* Constant to indicate "Xen" in unicode u16 format */
+static const u16 XEN_EFI_FW_VENDOR[] ={0x0058,0x0065,0x006E,0x0000};
 #endif
 
 struct vcpu *__init alloc_dom0_vcpu0(struct domain *dom0)
@@ -1222,6 +1225,51 @@ static int handle_node(struct domain *d, struct 
kernel_info *kinfo,
     return res;
 }
 #ifdef CONFIG_ACPI
+static int estimate_acpi_size(struct domain *d,struct kernel_info *kinfo, 
struct membank tbl_add[])
+{
+    int size = 0;
+    u64 addr;
+    struct acpi_table_header *table;
+    struct acpi_table_rsdp *rsdp_tbl;
+
+    set_acpi_size(size);
+    tbl_add[TBL_EFIT].size = sizeof(struct efi_system_table)
+        + sizeof(struct efi_config_table)
+        + sizeof(XEN_EFI_FW_VENDOR);
+
+    tbl_add[TBL_MMAP].size = sizeof(struct efi_memory_desc)
+        *(kinfo->mem.nr_banks + acpi_mem.nr_banks + TBL_MMAX);
+    tbl_add[TBL_XENV].size = sizeof(struct acpi_table_xenv);
+    tbl_add[TBL_STAO].size = sizeof(struct acpi_table_stao);
+
+    addr = acpi_os_get_root_pointer();
+    if( !addr )
+        return -ENODEV;
+
+    rsdp_tbl = acpi_os_map_memory(addr, sizeof(struct acpi_table_rsdp));
+    if( !rsdp_tbl )
+        return -ENOMEM;
+
+    table = acpi_os_map_memory(rsdp_tbl->xsdt_physical_address,
+                               sizeof(struct acpi_table_header));
+    if ( !table )
+        return -ENOMEM;
+
+    tbl_add[TBL_XSDT].size = table->length
+        +( NR_NEW_XEN_TABLES*sizeof(acpi_native_uint) );
+    tbl_add[TBL_XSDT].start = rsdp_tbl->xsdt_physical_address;
+    acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
+    acpi_os_unmap_memory(rsdp_tbl, sizeof(struct acpi_table_rsdp));
+    size = tbl_add[TBL_EFIT].size
+        + tbl_add[TBL_MMAP].size
+        + tbl_add[TBL_XENV].size
+        + tbl_add[TBL_STAO].size
+        + tbl_add[TBL_XSDT].size;
+
+    set_acpi_size(size);
+    return 0;
+}
+
 /*
  * Create place holder for efi values.
  * Actual values will be replaced later
@@ -1365,7 +1413,11 @@ static int create_acpi_dtb(struct domain *d, struct 
kernel_info *kinfo, struct m
     if ( ret < 0 )
         goto err;
 
-    return 0;
+    ret = estimate_acpi_size(d, kinfo, tbl_add);
+    if ( ret < 0 )
+        goto err;
+
+   return 0;
 
   err:
     printk("Device tree generation failed (%d).\n", ret);
-- 
1.9.1


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