From: Luca Fancellu <luca.fance...@arm.com>
Implement the MPU variant of `setup_frametable_mappings`. This function
will be called by `setup_mm` when an implementation for MPU systems is
added in a follow up commit.
Signed-off-by: Luca Fancellu <luca.fance...@arm.com>
Signed-off-by: Hari Limaye <hari.lim...@arm.com>
Reviewed-by: Michal Orzel <michal.or...@amd.com>
---
Changes from v1:
- Align ps and pe to page size
- Add sanity checking for frametable size, as in MMU version
- Add Michal's R-b
---
xen/arch/arm/mpu/mm.c | 33 +++++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
diff --git a/xen/arch/arm/mpu/mm.c b/xen/arch/arm/mpu/mm.c
index c6891607ec..3f155b7db2 100644
--- a/xen/arch/arm/mpu/mm.c
+++ b/xen/arch/arm/mpu/mm.c
@@ -168,6 +168,39 @@ int mpumap_contains_region(pr_t *table, uint8_t
nr_regions, paddr_t base,
return MPUMAP_REGION_NOTFOUND;
}
+/* Map a frame table to cover physical addresses ps through pe */
+void __init setup_frametable_mappings(paddr_t ps, paddr_t pe)
+{
+ mfn_t base_mfn;
+ paddr_t aligned_ps = ROUNDUP(ps, PAGE_SIZE);
+ paddr_t aligned_pe = ROUNDDOWN(pe, PAGE_SIZE);
+
+ unsigned long nr_pdxs = mfn_to_pdx(mfn_add(maddr_to_mfn(aligned_pe), -1)) -
+ mfn_to_pdx(maddr_to_mfn(aligned_ps)) + 1;
+ unsigned long frametable_size = nr_pdxs * sizeof(struct page_info);
+
+ /*
+ * The size of paddr_t should be sufficient for the complete range of
+ * physical address.
+ */
+ BUILD_BUG_ON((sizeof(paddr_t) * BITS_PER_BYTE) < PADDR_BITS);
+ BUILD_BUG_ON(sizeof(struct page_info) != PAGE_INFO_SIZE);
+
+ if ( frametable_size > FRAMETABLE_SIZE )
+ panic("The frametable cannot cover the physical region %#"PRIpaddr" -
%#"PRIpaddr"\n",
+ ps, pe);
+
+ frametable_base_pdx = paddr_to_pdx(aligned_ps);
+ frametable_size = ROUNDUP(frametable_size, PAGE_SIZE);
+
+ base_mfn = alloc_boot_pages(frametable_size >> PAGE_SHIFT, 1);
+ frame_table = (struct page_info *)mfn_to_virt(mfn_x(base_mfn));
+
+ memset(&frame_table[0], 0, nr_pdxs * sizeof(struct page_info));
+ memset(&frame_table[nr_pdxs], -1,
+ frametable_size - (nr_pdxs * sizeof(struct page_info)));
+}
+
/*
* Allocate an entry for a new EL2 MPU region in the bitmap xen_mpumap_mask.
* @param idx Set to the index of the allocated EL2 MPU region on success.
--
2.34.1
