[PATCH v3 27/34] xen/riscv: define an address of frame table

[Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>]

Also, the patch adds some helpful macros that assist in avoiding
the redefinition of memory layout for each MMU mode.

Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
---
Changes in V3:
 - drop OFFSET_BITS, and use PAGE_SHIFT instead.
 - code style fixes.
 - add comment how macros are useful.
 - move all memory related layout definitions close to comment with memory 
layout description.
 - make memory layout description generic for any MMU mode.
---
Changes in V2:
 - Nothing changed. Only rebase.
---
 xen/arch/riscv/include/asm/config.h | 85 +++++++++++++++++++----------
 1 file changed, 55 insertions(+), 30 deletions(-)

diff --git a/xen/arch/riscv/include/asm/config.h 
b/xen/arch/riscv/include/asm/config.h
index f0544c6a20..fb9fc9daaa 100644
--- a/xen/arch/riscv/include/asm/config.h
+++ b/xen/arch/riscv/include/asm/config.h
@@ -6,6 +6,14 @@
 #include <xen/const.h>
 #include <xen/page-size.h>
 
+#ifdef CONFIG_RISCV_64
+#define CONFIG_PAGING_LEVELS 3
+#define RV_STAGE1_MODE SATP_MODE_SV39
+#else
+#define CONFIG_PAGING_LEVELS 2
+#define RV_STAGE1_MODE SATP_MODE_SV32
+#endif
+
 /*
  * RISC-V64 Layout:
  *
@@ -22,25 +30,56 @@
  *
  * It means that:
  *   top VA bits are simply ignored for the purpose of translating to PA.
+#endif
  *
- * ============================================================================
- *    Start addr    |   End addr        |  Size  | Slot       |area description
- * ============================================================================
- * FFFFFFFFC0800000 |  FFFFFFFFFFFFFFFF |1016 MB | L2 511     | Unused
- * FFFFFFFFC0600000 |  FFFFFFFFC0800000 |  2 MB  | L2 511     | Fixmap
- * FFFFFFFFC0200000 |  FFFFFFFFC0600000 |  4 MB  | L2 511     | FDT
- * FFFFFFFFC0000000 |  FFFFFFFFC0200000 |  2 MB  | L2 511     | Xen
- *                 ...                  |  1 GB  | L2 510     | Unused
- * 0000003200000000 |  0000007F80000000 | 309 GB | L2 200-509 | Direct map
- *                 ...                  |  1 GB  | L2 199     | Unused
- * 0000003100000000 |  00000031C0000000 |  3 GB  | L2 196-198 | Frametable
- *                 ...                  |  1 GB  | L2 195     | Unused
- * 0000003080000000 |  00000030C0000000 |  1 GB  | L2 194     | VMAP
- *                 ...                  | 194 GB | L2 0 - 193 | Unused
- * ============================================================================
+ *       SATP_MODE_SV32   | SATP_MODE_SV39   | SATP_MODE_SV48   | 
SATP_MODE_SV57
+ *      
==================|==================|==================|=================
+ * BA0 | FFFFFFFFFFE00000 | FFFFFFFFC0000000 | FFFFFF8000000000 | 
FFFF000000000000
+ * BA1 | 0000000019000000 | 0000003200000000 | 0000640000000000 | 
00C8000000000000
+ * BA2 | 0000000018800000 | 0000003100000000 | 0000620000000000 | 
00C4000000000000
+ * BA3 | 0000000018400000 | 0000003080000000 | 0000610000000000 | 
00C2000000000000
  *
-#endif
+ * 
===============================================================================
+ * Start addr     |   End addr          |  Size  | Root PT slot | Area 
description
+ * 
===============================================================================
+ * BA0 + 0x800000 |  FFFFFFFFFFFFFFFF   |1016 MB |     511      | Unused
+ * BA0 + 0x400000 |  BA0 + 0x800000     |  2 MB  |     511      | Fixmap
+ * BA0 + 0x200000 |  BA0 + 0x400000     |  4 MB  |     511      | FDT
+ * BA0            |  BA0 + 0x200000     |  2 MB  |     511      | Xen
+ *                 ...                  |  1 GB  |     510      | Unused
+ * BA1 + 0x000000 |  BA1 + 0x4D80000000 | 309 GB |   200-509    | Direct map
+ *                 ...                  |  1 GB  |     199      | Unused
+ * BA2 + 0x000000 |  BA2 + 0xC0000000   |  3 GB  |   196-198    | Frametable
+ *                 ...                  |  1 GB  |     195      | Unused
+ * BA3 + 0x000000 |  BA3 + 0x40000000   |  1 GB  |     194      | VMAP
+ *                 ...                  | 194 GB |   0 - 193    | Unused
+ * 
===============================================================================
  */
+#define VPN_BITS    (9)
+
+#define HYP_PT_ROOT_LEVEL (CONFIG_PAGING_LEVELS - 1)
+
+#ifdef CONFIG_RISCV_64
+
+#define SLOTN_ENTRY_BITS        (HYP_PT_ROOT_LEVEL * VPN_BITS + PAGE_SHIFT)
+#define SLOTN(slot)             (_AT(vaddr_t, slot) << SLOTN_ENTRY_BITS)
+#define SLOTN_ENTRY_SIZE        SLOTN(1)
+
+#define XEN_VIRT_START 0xFFFFFFFFC0000000 /* (_AC(-1, UL) + 1 - GB(1)) */
+
+#define FRAMETABLE_VIRT_START   SLOTN(196)
+#define FRAMETABLE_SIZE         GB(3)
+#define FRAMETABLE_NR           (FRAMETABLE_SIZE / sizeof(*frame_table))
+#define FRAMETABLE_VIRT_END     (FRAMETABLE_VIRT_START + FRAMETABLE_SIZE - 1)
+
+#define VMAP_VIRT_START         SLOTN(194)
+#define VMAP_VIRT_SIZE          GB(1)
+
+#else
+#error "RV32 isn't supported"
+#endif
+
+#define HYPERVISOR_VIRT_START XEN_VIRT_START
 
 #if defined(CONFIG_RISCV_64)
 # define LONG_BYTEORDER 3
@@ -77,24 +116,10 @@
   name:
 #endif
 
-#ifdef CONFIG_RISCV_64
-#define XEN_VIRT_START 0xFFFFFFFFC0000000 /* (_AC(-1, UL) + 1 - GB(1)) */
-#else
-#error "RV32 isn't supported"
-#endif
-
 #define SMP_CACHE_BYTES (1 << 6)
 
 #define STACK_SIZE PAGE_SIZE
 
-#ifdef CONFIG_RISCV_64
-#define CONFIG_PAGING_LEVELS 3
-#define RV_STAGE1_MODE SATP_MODE_SV39
-#else
-#define CONFIG_PAGING_LEVELS 2
-#define RV_STAGE1_MODE SATP_MODE_SV32
-#endif
-
 #define IDENT_AREA_SIZE 64
 
 #endif /* __RISCV_CONFIG_H__ */
-- 
2.43.0