[Xen-devel] [PATCH] add hypercall function for retrieving EDID info

["Jan Beulich" <jbeulich@xxxxxxxxxx>]

Note that this depends on the prior submissions adjusting guest copy
and retrieving EDD info.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>

Index: 2007-06-18/xen/arch/x86/platform_hypercall.c
===================================================================
--- 2007-06-18.orig/xen/arch/x86/platform_hypercall.c   2007-06-18 
11:05:17.000000000 +0200
+++ 2007-06-18/xen/arch/x86/platform_hypercall.c        2007-06-18 
17:46:20.000000000 +0200
@@ -31,10 +31,15 @@ struct edd {
        unsigned char edd_info_nr;
 };
 
+struct ddc {
+    uint8_t capabilities, edid_transfer_time, edid[128];
+};
+
 #ifndef COMPAT
 typedef long ret_t;
 DEFINE_SPINLOCK(xenpf_lock);
 struct edd edd;
+struct ddc ddc;
 # undef copy_from_compat
 # define copy_from_compat copy_from_guest
 # undef copy_to_compat
@@ -42,6 +47,7 @@ struct edd edd;
 #else
 extern spinlock_t xenpf_lock;
 extern struct edd edd;
+extern struct ddc ddc;
 #endif
 
 ret_t do_platform_op(XEN_GUEST_HANDLE(xen_platform_op_t) u_xenpf_op)
@@ -226,6 +232,21 @@ ret_t do_platform_op(XEN_GUEST_HANDLE(xe
             else
                 ret = -ESRCH;
             break;
+        case XEN_FW_DDC_INFO:
+            if ( op->u.firmware_info.index == 0 )
+            {
+                op->u.firmware_info.u.ddc_info.capabilities       = 
ddc.capabilities;
+                op->u.firmware_info.u.ddc_info.edid_transfer_time = 
ddc.edid_transfer_time;
+                if ( copy_field_to_guest(u_xenpf_op, op, 
u.firmware_info.u.ddc_info.capabilities) ||
+                     copy_field_to_guest(u_xenpf_op, op, 
u.firmware_info.u.ddc_info.edid_transfer_time) ||
+                     copy_to_compat(op->u.firmware_info.u.ddc_info.edid,
+                                    ddc.edid,
+                                    ARRAY_SIZE(ddc.edid)) )
+                    ret = -EFAULT;
+            }
+            else
+                ret = -ESRCH;
+            break;
         default:
             ret = -EINVAL;
             break;
@@ -245,11 +266,21 @@ ret_t do_platform_op(XEN_GUEST_HANDLE(xe
 #ifndef COMPAT
 static int __init firmware_init(void)
 {
+    extern uint16_t boot_edid_caps;
+    extern uint8_t boot_edid_info[];
+
     memcpy(edd.mbr_signature, bootsym(boot_edd_signature), 
sizeof(edd.mbr_signature));
     memcpy(edd.edd_info, bootsym(boot_edd_info), sizeof(edd.edd_info));
     edd.mbr_signature_nr = bootsym(boot_edd_signature_nr);
     edd.edd_info_nr = bootsym(boot_edd_info_nr);
 
+    if ( bootsym(boot_edid_caps) != 0x1313 )
+    {
+        ddc.capabilities = bootsym(boot_edid_caps);
+        ddc.edid_transfer_time = bootsym(boot_edid_caps) >> 8;
+        memcpy(ddc.edid, bootsym(boot_edid_info), sizeof(ddc.edid));
+    }
+
     return 0;
 }
 __initcall(firmware_init);
Index: 2007-06-18/xen/include/public/platform.h
===================================================================
--- 2007-06-18.orig/xen/include/public/platform.h       2007-06-18 
11:05:17.000000000 +0200
+++ 2007-06-18/xen/include/public/platform.h    2007-06-18 10:39:22.000000000 
+0200
@@ -119,6 +119,7 @@ DEFINE_XEN_GUEST_HANDLE(xenpf_platform_q
 #define XEN_FW_EDD_INFO           2 /* from int 13 AH=41 */
 #define XEN_FW_EDD_PARAMS         3 /* from int 13 AH=48 */
 #define XEN_FW_MBR_SIGNATURE      4
+#define XEN_FW_DDC_INFO           5 /* from int 10 AX=4f15 */
 struct xenpf_firmware_info {
     /* IN variables. */
     uint32_t type;
@@ -138,6 +139,12 @@ struct xenpf_firmware_info {
         /* first uint16_t of buffer must be set to buffer size */
         XEN_GUEST_HANDLE(void) edd_params;
         uint32_t mbr_signature;
+        struct {
+            uint8_t capabilities;
+            uint8_t edid_transfer_time;
+            /* must refer to 128-byte buffer */
+            XEN_GUEST_HANDLE(uint8_t) edid;
+        } ddc_info;
     } u;
 };
 typedef struct xenpf_firmware_info xenpf_firmware_info_t;




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