[Minios-devel] [PATCH v3 29/43] arm64: set the mapping for console and xenbus

[Huang Shijie <shijie.huang@xxxxxxx>]

This patch sets the mapping for console and xenbus.
Just following what x86 does:

   1.) Add VIRT_KERNEL_AREA/VIRT_DEMAND_AREA to limit
       the memory ranges for alloc_virt_kernel().

   2.) Change map_frame_virt() to setup the page table for
       console and xenbus.

Signed-off-by: Huang Shijie <shijie.huang@xxxxxxx>
---
 arch/arm/mm.c         | 44 +++++++++++++++++++++++++++++++++++++++-----
 include/arm/arch_mm.h |  2 ++
 2 files changed, 41 insertions(+), 5 deletions(-)

diff --git a/arch/arm/mm.c b/arch/arm/mm.c
index ed59159..e83ac70 100644
--- a/arch/arm/mm.c
+++ b/arch/arm/mm.c
@@ -233,12 +233,15 @@ void init_pagetable(unsigned long *start_pfn, unsigned 
long base,
     init_pagetable_ok = 1;
 }
 
+static unsigned long virt_kernel_area_end;
 void arch_mm_preinit(void *dtb_pointer)
 {
     paddr_t **dtb_p = dtb_pointer;
     paddr_t *dtb = *dtb_p;
     uintptr_t end = (uintptr_t) &_end;
 
+    virt_kernel_area_end = VIRT_KERNEL_AREA;
+
     dtb = to_virt(((paddr_t)dtb));
     first_free_pfn = PFN_UP(to_phys(end));
     min_mem_pfn = PFN_UP(to_phys(_text) + MIN_MEM_SIZE);
@@ -254,6 +257,42 @@ void arch_mm_preinit(void *dtb_pointer)
     *dtb_p = dtb;
 }
 
+static unsigned long alloc_virt_kernel(unsigned n_pages)
+{
+    unsigned long addr;
+
+    addr = virt_kernel_area_end;
+    virt_kernel_area_end += PAGE_SIZE * n_pages;
+    ASSERT(virt_kernel_area_end <= VIRT_DEMAND_AREA);
+
+    return addr;
+}
+
+static paddr_t alloc_new_page(void)
+{
+    unsigned long page;
+
+    page = alloc_page();
+    if (!page)
+        BUG();
+    memset((void *)page, 0, PAGE_SIZE);
+    dsb(ishst);
+    return to_phys(page);
+}
+
+unsigned long map_frame_virt(unsigned long mfn)
+{
+    unsigned long addr;
+    int ret;
+
+    addr = alloc_virt_kernel(1);
+    ret = build_pagetable(addr, mfn, 1, MEM_DEF_ATTR,
+                    init_pagetable_ok? alloc_new_page: early_alloc_page, 3);
+    ASSERT(ret == 0);
+
+    return addr;
+}
+
 void arch_init_mm(unsigned long *start_pfn_p, unsigned long *max_pfn_p)
 {
     int memory;
@@ -394,8 +433,3 @@ grant_entry_v1_t *arch_init_gnttab(int nr_grant_frames)
 
     return to_virt(gnttab_table);
 }
-
-unsigned long map_frame_virt(unsigned long mfn)
-{
-    return mfn_to_virt(mfn);
-}
diff --git a/include/arm/arch_mm.h b/include/arm/arch_mm.h
index db6e781..4f3fd8f 100644
--- a/include/arm/arch_mm.h
+++ b/include/arm/arch_mm.h
@@ -5,6 +5,8 @@ typedef uint64_t paddr_t;
 #define PRIpaddr "lx"
 #define MIN_MEM_SIZE            (0x400000)
 #define MAX_MEM_SIZE            (1UL << 39)
+#define VIRT_KERNEL_AREA        ((unsigned long)to_virt(MAX_MEM_SIZE))
+#define VIRT_DEMAND_AREA        (VIRT_KERNEL_AREA + MAX_MEM_SIZE)
 
 typedef uint64_t lpae_t;
 
-- 
2.7.4


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