From 399a61de4a23f1f75f85ed070bff2d7d70a710cc Mon Sep 17 00:00:00 2001
From: schulz <schulz@fb15a70f-31f2-0310-bbcc-cdcc74a49acc>
Date: Mon, 30 Mar 2015 17:26:08 +0000
Subject: [PATCH] Query VideoCore for VMEM (needed for further MMU mapping)

git-svn-id: https://svn.aros.org/svn/aros/trunk/AROS@50260 fb15a70f-31f2-0310-bbcc-cdcc74a49acc
---
 arch/arm-raspi/boot/boot.c     | 31 +++++++++++++++++++++++++++++++
 compiler/include/aros/kernel.h |  4 +++-
 2 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/arch/arm-raspi/boot/boot.c b/arch/arm-raspi/boot/boot.c
index 69a690a89b..4d9e626bdc 100644
--- a/arch/arm-raspi/boot/boot.c
+++ b/arch/arm-raspi/boot/boot.c
@@ -15,6 +15,7 @@
 #include <stdint.h>
 
 #include <hardware/bcm283x.h>
+#include <hardware/videocore.h>
 
 #include "boot.h"
 #include "serialdebug.h"
@@ -22,6 +23,7 @@
 #include "atags.h"
 #include "elf.h"
 
+#include "vc_mb.h"
 #include "vc_fb.h"
 
 #define DBOOT(x) x
@@ -134,6 +136,34 @@ static void parse_atags(struct tag *tags)
     }
 }
 
+void query_vmem()
+{
+    volatile unsigned int *vc_msg = (unsigned int *) MESSAGE_BUFFER;
+
+    kprintf("[BOOT] Query VC memory\n");
+    vc_msg[0] = 8 * 4;
+    vc_msg[1] = VCTAG_REQ;
+    vc_msg[2] = VCTAG_GETVCRAM;
+    vc_msg[3] = 8;
+    vc_msg[4] = 0;
+    vc_msg[5] = 0;
+    vc_msg[6] = 0;
+    vc_msg[7] = 0;
+
+    vcmb_write(VCMB_BASE, VCMB_PROPCHAN, vc_msg);
+    vc_msg = vcmb_read(VCMB_BASE, VCMB_PROPCHAN);
+
+    kprintf("[BOOT] Base = %08x, Size = %08x\n", vc_msg[5], vc_msg[6]);
+
+    boottag->ti_Tag = KRN_VMEMLower;
+    boottag->ti_Data = vc_msg[5];
+    boottag++;
+
+    boottag->ti_Tag = KRN_VMEMUpper;
+    boottag->ti_Data = vc_msg[5] + vc_msg[6];
+    boottag++;
+}
+
 static const char bootstrapName[] = "Bootstrap/RasPI ARM";
 
 void boot(uintptr_t dummy, uintptr_t arch, struct tag * atags)
@@ -245,6 +275,7 @@ void boot(uintptr_t dummy, uintptr_t arch, struct tag * atags)
     })
 
     parse_atags(atags);
+    query_vmem();
 
     kprintf("[BOOT] Bootstrap @ %08x-%08x\n", &__bootstrap_start, &__bootstrap_end);
 
diff --git a/compiler/include/aros/kernel.h b/compiler/include/aros/kernel.h
index 35648a5e55..1c1172f05b 100644
--- a/compiler/include/aros/kernel.h
+++ b/compiler/include/aros/kernel.h
@@ -2,7 +2,7 @@
 #define AROS_KERNEL_H
 
 /*
-    Copyright © 1995-2011, The AROS Development Team. All rights reserved.
+    Copyright � 1995-2011, The AROS Development Team. All rights reserved.
     $Id$
 
     Desc: TagItems for the kernel.resource
@@ -58,6 +58,8 @@ typedef enum
 #define KRN_EFISystemTable	(KRN_Dummy + 23) /* Pointer to EFI system table				*/
 #define KRN_KernelStackBase     (KRN_Dummy + 26) /* Kickstart Boot Task stack base address */
 #define KRN_KernelStackSize     (KRN_Dummy + 27) /* Kickstart Boot Task stack size */
+#define KRN_VMEMLower           (KRN_Dummy + 28) /* Lowest address of framebuffer, e.g. on embedded systems */
+#define KRN_VMEMUpper           (KRN_Dummy + 29) /* Highest address of framebuffer, e.g. on embedded systems */
 
 /* Magic value passed by the bootstrap as second parameter */
 #define AROS_BOOT_MAGIC AROS_MAKE_ID('A', 'R', 'O', 'S')
-- 
2.11.4.GIT