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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /arch/xtensa/mm/highmem.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/xtensa/mm/highmem.c')
-rw-r--r--arch/xtensa/mm/highmem.c59
1 files changed, 59 insertions, 0 deletions
diff --git a/arch/xtensa/mm/highmem.c b/arch/xtensa/mm/highmem.c
new file mode 100644
index 0000000000..35c4f7d4a3
--- /dev/null
+++ b/arch/xtensa/mm/highmem.c
@@ -0,0 +1,59 @@
+/*
+ * High memory support for Xtensa architecture
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file "COPYING" in the main directory of
+ * this archive for more details.
+ *
+ * Copyright (C) 2014 Cadence Design Systems Inc.
+ */
+
+#include <linux/export.h>
+#include <linux/highmem.h>
+#include <asm/tlbflush.h>
+
+#if DCACHE_WAY_SIZE > PAGE_SIZE
+unsigned int last_pkmap_nr_arr[DCACHE_N_COLORS];
+wait_queue_head_t pkmap_map_wait_arr[DCACHE_N_COLORS];
+
+static void __init kmap_waitqueues_init(void)
+{
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(pkmap_map_wait_arr); ++i)
+ init_waitqueue_head(pkmap_map_wait_arr + i);
+}
+
+static inline enum fixed_addresses kmap_idx(int type, unsigned long color)
+{
+ int idx = (type + KM_MAX_IDX * smp_processor_id()) * DCACHE_N_COLORS;
+
+ /*
+ * The fixmap operates top down, so the color offset needs to be
+ * reverse as well.
+ */
+ return idx + DCACHE_N_COLORS - 1 - color;
+}
+
+enum fixed_addresses kmap_local_map_idx(int type, unsigned long pfn)
+{
+ return kmap_idx(type, DCACHE_ALIAS(pfn << PAGE_SHIFT));
+}
+
+enum fixed_addresses kmap_local_unmap_idx(int type, unsigned long addr)
+{
+ return kmap_idx(type, DCACHE_ALIAS(addr));
+}
+
+#else
+static inline void kmap_waitqueues_init(void) { }
+#endif
+
+void __init kmap_init(void)
+{
+ /* Check if this memory layout is broken because PKMAP overlaps
+ * page table.
+ */
+ BUILD_BUG_ON(PKMAP_BASE < TLBTEMP_BASE_1 + TLBTEMP_SIZE);
+ kmap_waitqueues_init();
+}