[PATCH v8 12/17] xen/riscv: add minimal stuff to page.h to build full Xen

[Oleksii Kurochko <oleksii.kurochko@gmail.com>]

Signed-off-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
---
Changes in V5-V8:
 - Nothing changed. Only rebase.
---
Changes in V4:
---
 - Change message -> subject in "Changes in V3"
 - s/BUG/BUG_ON("...")
 - Do proper rebase ( pfn_to_paddr() and paddr_to_pfn() aren't removed ).
---
Changes in V3:
 - update the commit subject
 - add implemetation of PAGE_HYPERVISOR macros
 - add Acked-by: Jan Beulich <jbeulich@suse.com>
 - drop definition of pfn_to_addr, and paddr_to_pfn in <asm/mm.h>
---
Changes in V2:
 - Nothing changed. Only rebase.
---
 xen/arch/riscv/include/asm/page.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/xen/arch/riscv/include/asm/page.h b/xen/arch/riscv/include/asm/page.h
index 95074e29b3..c831e16417 100644
--- a/xen/arch/riscv/include/asm/page.h
+++ b/xen/arch/riscv/include/asm/page.h
@@ -6,6 +6,7 @@
 #ifndef __ASSEMBLY__
 
 #include <xen/const.h>
+#include <xen/bug.h>
 #include <xen/types.h>
 
 #include <asm/mm.h>
@@ -32,6 +33,10 @@
 #define PTE_LEAF_DEFAULT            (PTE_VALID | PTE_READABLE | PTE_WRITABLE)
 #define PTE_TABLE                   (PTE_VALID)
 
+#define PAGE_HYPERVISOR_RW          (PTE_VALID | PTE_READABLE | PTE_WRITABLE)
+
+#define PAGE_HYPERVISOR             PAGE_HYPERVISOR_RW
+
 /* Calculate the offsets into the pagetables for a given VA */
 #define pt_linear_offset(lvl, va)   ((va) >> XEN_PT_LEVEL_SHIFT(lvl))
 
@@ -62,6 +67,20 @@ static inline bool pte_is_valid(pte_t p)
     return p.pte & PTE_VALID;
 }
 
+static inline void invalidate_icache(void)
+{
+    BUG_ON("unimplemented");
+}
+
+#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
+#define copy_page(dp, sp) memcpy(dp, sp, PAGE_SIZE)
+
+/* TODO: Flush the dcache for an entire page. */
+static inline void flush_page_to_ram(unsigned long mfn, bool sync_icache)
+{
+    BUG_ON("unimplemented");
+}
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* _ASM_RISCV_PAGE_H */
-- 
2.44.0