[Xen-devel] [PATCH RFC 32/35] arm : acpi map xen environment table to dom0

[parth.dixit@xxxxxxxxxx]

From: Parth Dixit <parth.dixit@xxxxxxxxxx>

xen environment table contains the grant table address,size and event
channel interrupt information required by dom0.

Signed-off-by: Parth Dixit <parth.dixit@xxxxxxxxxx>
---
 xen/arch/arm/arm64/acpi/arm-core.c | 52 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 51 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/arm64/acpi/arm-core.c 
b/xen/arch/arm/arm64/acpi/arm-core.c
index 9fd02f9..9e9285c 100644
--- a/xen/arch/arm/arm64/acpi/arm-core.c
+++ b/xen/arch/arm/arm64/acpi/arm-core.c
@@ -33,7 +33,6 @@
 #include <asm/cputype.h>
 #include <asm/acpi.h>
 #include <asm/p2m.h>
-
 /*
  * We never plan to use RSDT on arm/arm64 as its deprecated in spec but this
  * variable is still required by the ACPI core
@@ -297,6 +296,49 @@ static int map_stao_table(struct domain *d, u64 *mstao)
     return 0;
 }
 
+static int map_xenv_table(struct domain *d, u64 *mxenv)
+{
+    u64 addr;
+    u64 size;
+    int res;
+    u8 checksum;
+    struct acpi_table_xenv *xenv=NULL;
+
+    xenv = ACPI_ALLOCATE_ZEROED( sizeof(struct acpi_table_xenv) );
+    if( xenv == NULL )
+            return -ENOMEM;
+
+    ACPI_MEMCPY(xenv->header.signature, ACPI_SIG_XENV, 4);
+    xenv->header.length = sizeof(struct acpi_table_header)+12;
+    xenv->header.checksum = 0;
+    ACPI_MEMCPY(xenv->header.oem_id, "XenVMM", 6);
+    ACPI_MEMCPY(xenv->header.oem_table_id, "RTSMVEV8", 8);
+    xenv->header.revision = 1;
+    ACPI_MEMCPY(xenv->header.asl_compiler_id, "INTL", 4);
+    xenv->header.asl_compiler_revision = 0x20140828;
+    xenv->gnt_start = 0x00000010000000;
+    xenv->gnt_size = 0x20000;
+    xenv->evt_intr = 31;
+    xenv->evt_intr_flag =3;
+    size = sizeof(struct acpi_table_xenv);
+    checksum = acpi_tb_checksum(ACPI_CAST_PTR(u8, xenv), size);
+    xenv->header.checksum = (u8)( xenv->header.checksum - checksum );
+    *mxenv = addr = virt_to_maddr(xenv);
+
+    res = map_ram_regions(d,
+                        paddr_to_pfn(addr & PAGE_MASK),
+                        DIV_ROUND_UP(size, PAGE_SIZE),
+                        paddr_to_pfn(addr & PAGE_MASK));
+    if ( res )
+    {
+         printk(XENLOG_ERR "Unable to map 0x%"PRIx64
+                " - 0x%"PRIx64" in domain \n",
+                addr & PAGE_MASK, PAGE_ALIGN(addr + size) - 1);
+         return res;
+    }
+
+    return 0;
+}
 
 #define NR_NEW_XEN_TABLES 2
 
@@ -346,6 +388,14 @@ static int map_xsdt_table(struct domain *d, u64 *xsdt)
         ( ( (size - sizeof(struct acpi_table_header) ) /
             sizeof(acpi_native_uint) ) );
 
+    /* map xen env table */
+    res = map_xenv_table(d, &addr);
+    if(res)
+            return res;
+
+    table_entry--;
+    *table_entry = addr ;
+
     /* map stao table */
     map_stao_table(d, &addr);
     if(res)
-- 
1.9.1


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