[PATCH v5 1/7] xen/riscv: introduce boot information structure

[Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>]

The structure holds information about:
1. linker start/end address
2. load start/end address

Also the patch introduces offsets for boot information structure
members to access them in assembly code.

Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
---
Changes in V5:
 * the patch was introduced in the current patch series (V5)
---
 xen/arch/riscv/include/asm/boot-info.h | 15 +++++++++++++++
 xen/arch/riscv/riscv64/asm-offsets.c   |  3 +++
 2 files changed, 18 insertions(+)
 create mode 100644 xen/arch/riscv/include/asm/boot-info.h

diff --git a/xen/arch/riscv/include/asm/boot-info.h 
b/xen/arch/riscv/include/asm/boot-info.h
new file mode 100644
index 0000000000..cda3d278f5
--- /dev/null
+++ b/xen/arch/riscv/include/asm/boot-info.h
@@ -0,0 +1,15 @@
+#ifndef _ASM_BOOT_INFO_H
+#define _ASM_BOOT_INFO_H
+
+extern struct boot_info {
+    unsigned long linker_start;
+    unsigned long linker_end;
+    unsigned long load_start;
+    unsigned long load_end;
+} boot_info;
+
+/* LINK_TO_LOAD() and LOAD_TO_LINK() works only when MMU isn't enabled. */
+#define LINK_TO_LOAD(addr) ((addr) - boot_info.linker_start + 
boot_info.load_start)
+#define LOAD_TO_LINK(addr) ((addr) - boot_info.load_start + 
boot_info.linker_start)
+
+#endif
\ No newline at end of file
diff --git a/xen/arch/riscv/riscv64/asm-offsets.c 
b/xen/arch/riscv/riscv64/asm-offsets.c
index d632b75c2a..6b89e9a91d 100644
--- a/xen/arch/riscv/riscv64/asm-offsets.c
+++ b/xen/arch/riscv/riscv64/asm-offsets.c
@@ -1,5 +1,6 @@
 #define COMPILE_OFFSETS
 
+#include <asm/boot-info.h>
 #include <asm/processor.h>
 #include <xen/types.h>
 
@@ -50,4 +51,6 @@ void asm_offsets(void)
     OFFSET(CPU_USER_REGS_SEPC, struct cpu_user_regs, sepc);
     OFFSET(CPU_USER_REGS_SSTATUS, struct cpu_user_regs, sstatus);
     OFFSET(CPU_USER_REGS_PREGS, struct cpu_user_regs, pregs);
+    OFFSET(BI_LINKER_START, struct boot_info, linker_start);
+    OFFSET(BI_LOAD_START, struct boot_info, load_start);
 }
-- 
2.39.2