[PATCH v4 06/13] xen/arm64: Move setup_fixmap() to create_page_tables()

[Henry Wang <Henry.Wang@xxxxxxx>]

The original assembly setup_fixmap() is actually doing two seperate
tasks, one is enabling the early UART when earlyprintk on, and the
other is to set up the fixmap (even when earlyprintk is off).

Per discussion in [1], since commit
9d267c049d92 ("xen/arm64: Rework the memory layout"), there is no
chance that the fixmap and the mapping of early UART will clash with
the 1:1 mapping. Therefore the mapping of both the fixmap and the
early UART can be moved to the end of create_pagetables(). For the
future MPU support work, the early UART mapping could then be moved
in prepare_early_mappings().

No functional change intended.

[1] 
https://lore.kernel.org/xen-devel/78862bb8-fd7f-5a51-a7ae-3c5b5998ed80@xxxxxxx/

Signed-off-by: Henry Wang <Henry.Wang@xxxxxxx>
---
v4:
- Rework "[v3,12/52] xen/mmu: extract early uart mapping from setup_fixmap"
---
 xen/arch/arm/arm64/head.S     |  1 -
 xen/arch/arm/arm64/mmu/head.S | 50 ++++++++++++-----------------------
 2 files changed, 17 insertions(+), 34 deletions(-)

diff --git a/xen/arch/arm/arm64/head.S b/xen/arch/arm/arm64/head.S
index e4f579a48e..56f68a8e37 100644
--- a/xen/arch/arm/arm64/head.S
+++ b/xen/arch/arm/arm64/head.S
@@ -275,7 +275,6 @@ real_start_efi:
         b     enable_boot_cpu_mm
 
 primary_switched:
-        bl    setup_fixmap
 #ifdef CONFIG_EARLY_PRINTK
         /* Use a virtual address to access the UART. */
         ldr   x23, =EARLY_UART_VIRTUAL_ADDRESS
diff --git a/xen/arch/arm/arm64/mmu/head.S b/xen/arch/arm/arm64/mmu/head.S
index b7c3dd423a..6bd94c3a45 100644
--- a/xen/arch/arm/arm64/mmu/head.S
+++ b/xen/arch/arm/arm64/mmu/head.S
@@ -231,6 +231,23 @@ link_from_second_id:
         create_table_entry boot_second_id, boot_third_id, x19, 2, x0, x1, x2
 link_from_third_id:
         create_mapping_entry boot_third_id, x19, x19, x0, x1, x2
+
+#ifdef CONFIG_EARLY_PRINTK
+        /* Add UART to the fixmap table */
+        ldr   x0, =EARLY_UART_VIRTUAL_ADDRESS
+        /* x23: Early UART base physical address */
+        create_mapping_entry xen_fixmap, x0, x23, x1, x2, x3, type=PT_DEV_L3
+#endif
+        /* Map fixmap into boot_second */
+        ldr   x0, =FIXMAP_ADDR(0)
+        create_table_entry boot_second, xen_fixmap, x0, 2, x1, x2, x3
+        /* Ensure any page table updates made above have occurred. */
+        dsb   nshst
+        /*
+         * The fixmap area will be used soon after. So ensure no hardware
+         * translation happens before the dsb completes.
+         */
+        isb
         ret
 
 virtphys_clash:
@@ -395,39 +412,6 @@ identity_mapping_removed:
         ret
 ENDPROC(remove_identity_mapping)
 
-/*
- * Map the UART in the fixmap (when earlyprintk is used) and hook the
- * fixmap table in the page tables.
- *
- * The fixmap cannot be mapped in create_page_tables because it may
- * clash with the 1:1 mapping.
- *
- * Inputs:
- *   x20: Physical offset
- *   x23: Early UART base physical address
- *
- * Clobbers x0 - x3
- */
-ENTRY(setup_fixmap)
-#ifdef CONFIG_EARLY_PRINTK
-        /* Add UART to the fixmap table */
-        ldr   x0, =EARLY_UART_VIRTUAL_ADDRESS
-        create_mapping_entry xen_fixmap, x0, x23, x1, x2, x3, type=PT_DEV_L3
-#endif
-        /* Map fixmap into boot_second */
-        ldr   x0, =FIXMAP_ADDR(0)
-        create_table_entry boot_second, xen_fixmap, x0, 2, x1, x2, x3
-        /* Ensure any page table updates made above have occurred. */
-        dsb   nshst
-        /*
-         * The fixmap area will be used soon after. So ensure no hardware
-         * translation happens before the dsb completes.
-         */
-        isb
-
-        ret
-ENDPROC(setup_fixmap)
-
 /* Fail-stop */
 fail:   PRINT("- Boot failed -\r\n")
 1:      wfe
-- 
2.25.1