RISC-V: Various XIP fixes

This fixes a handful of issues with the XIP support, which has bit
rotted some lately.

* palmer/riscv-xip:
  RISC-V: Fix the XIP build
  RISC-V: Split out the XIP fixups into their own file
  RISC-V: ignore xipImage
  RISC-V: Avoid empty create_*_mapping definitions

Author: palmer-dabbelt

arch/riscv/boot/.gitignore

@@ -4,3 +4,4 @@ Image.*
 loader
 loader.lds
 loader.bin
+xipImage

arch/riscv/include/asm/asm.h

@@ -67,30 +67,4 @@
 #error "Unexpected __SIZEOF_SHORT__"
 #endif
 
-#ifdef __ASSEMBLY__
-
-/* Common assembly source macros */
-
-#ifdef CONFIG_XIP_KERNEL
-.macro XIP_FIXUP_OFFSET reg
-	REG_L t0, _xip_fixup
-	add \reg, \reg, t0
-.endm
-.macro XIP_FIXUP_FLASH_OFFSET reg
-	la t1, __data_loc
-	REG_L t1, _xip_phys_offset
-	sub \reg, \reg, t1
-	add \reg, \reg, t0
-.endm
-_xip_fixup: .dword CONFIG_PHYS_RAM_BASE - CONFIG_XIP_PHYS_ADDR - XIP_OFFSET
-_xip_phys_offset: .dword CONFIG_XIP_PHYS_ADDR + XIP_OFFSET
-#else
-.macro XIP_FIXUP_OFFSET reg
-.endm
-.macro XIP_FIXUP_FLASH_OFFSET reg
-.endm
-#endif /* CONFIG_XIP_KERNEL */
-
-#endif /* __ASSEMBLY__ */
-
 #endif /* _ASM_RISCV_ASM_H */

arch/riscv/include/asm/xip_fixup.h

@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * XIP fixup macros, only useful in assembly.
+ */
+#ifndef _ASM_RISCV_XIP_FIXUP_H
+#define _ASM_RISCV_XIP_FIXUP_H
+
+#include <linux/pgtable.h>
+
+#ifdef CONFIG_XIP_KERNEL
+.macro XIP_FIXUP_OFFSET reg
+        REG_L t0, _xip_fixup
+        add \reg, \reg, t0
+.endm
+.macro XIP_FIXUP_FLASH_OFFSET reg
+	la t1, __data_loc
+	REG_L t1, _xip_phys_offset
+	sub \reg, \reg, t1
+	add \reg, \reg, t0
+.endm
+
+_xip_fixup: .dword CONFIG_PHYS_RAM_BASE - CONFIG_XIP_PHYS_ADDR - XIP_OFFSET
+_xip_phys_offset: .dword CONFIG_XIP_PHYS_ADDR + XIP_OFFSET
+#else
+.macro XIP_FIXUP_OFFSET reg
+.endm
+.macro XIP_FIXUP_FLASH_OFFSET reg
+.endm
+#endif /* CONFIG_XIP_KERNEL */
+
+#endif

arch/riscv/kernel/head.S

@@ -14,6 +14,7 @@
 #include <asm/cpu_ops_sbi.h>
 #include <asm/hwcap.h>
 #include <asm/image.h>
+#include <asm/xip_fixup.h>
 #include "efi-header.S"
 
 __HEAD

arch/riscv/kernel/suspend_entry.S

@@ -8,6 +8,7 @@
 #include <asm/asm.h>
 #include <asm/asm-offsets.h>
 #include <asm/csr.h>
+#include <asm/xip_fixup.h>
 
 	.text
 	.altmacro

arch/riscv/mm/init.c

@@ -567,9 +567,9 @@ static void __init create_p4d_mapping(p4d_t *p4dp,
 	create_pte_mapping(__nextp, __va, __pa, __sz, __prot)
 #define fixmap_pgd_next		((uintptr_t)fixmap_pte)
 #define early_dtb_pgd_next	((uintptr_t)early_dtb_pmd)
-#define create_p4d_mapping(__pmdp, __va, __pa, __sz, __prot)
-#define create_pud_mapping(__pmdp, __va, __pa, __sz, __prot)
-#define create_pmd_mapping(__pmdp, __va, __pa, __sz, __prot)
+#define create_p4d_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0)
+#define create_pud_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0)
+#define create_pmd_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0)
 #endif /* __PAGETABLE_PMD_FOLDED */
 
 void __init create_pgd_mapping(pgd_t *pgdp,
@@ -660,7 +660,7 @@ static __init pgprot_t pgprot_from_va(uintptr_t va)
 }
 #endif /* CONFIG_STRICT_KERNEL_RWX */
 
-#ifdef CONFIG_64BIT
+#if defined(CONFIG_64BIT) && !defined(CONFIG_XIP_KERNEL)
 static void __init disable_pgtable_l5(void)
 {
 	pgtable_l5_enabled = false;