summaryrefslogtreecommitdiffstats
path: root/arch/openrisc/mm/cache.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /arch/openrisc/mm/cache.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/openrisc/mm/cache.c')
-rw-r--r--arch/openrisc/mm/cache.c57
1 files changed, 57 insertions, 0 deletions
diff --git a/arch/openrisc/mm/cache.c b/arch/openrisc/mm/cache.c
new file mode 100644
index 000000000..534a52ec5
--- /dev/null
+++ b/arch/openrisc/mm/cache.c
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * OpenRISC cache.c
+ *
+ * Linux architectural port borrowing liberally from similar works of
+ * others. All original copyrights apply as per the original source
+ * declaration.
+ *
+ * Modifications for the OpenRISC architecture:
+ * Copyright (C) 2015 Jan Henrik Weinstock <jan.weinstock@rwth-aachen.de>
+ */
+
+#include <asm/spr.h>
+#include <asm/spr_defs.h>
+#include <asm/cache.h>
+#include <asm/cacheflush.h>
+#include <asm/tlbflush.h>
+
+static __always_inline void cache_loop(struct page *page, const unsigned int reg)
+{
+ unsigned long paddr = page_to_pfn(page) << PAGE_SHIFT;
+ unsigned long line = paddr & ~(L1_CACHE_BYTES - 1);
+
+ while (line < paddr + PAGE_SIZE) {
+ mtspr(reg, line);
+ line += L1_CACHE_BYTES;
+ }
+}
+
+void local_dcache_page_flush(struct page *page)
+{
+ cache_loop(page, SPR_DCBFR);
+}
+EXPORT_SYMBOL(local_dcache_page_flush);
+
+void local_icache_page_inv(struct page *page)
+{
+ cache_loop(page, SPR_ICBIR);
+}
+EXPORT_SYMBOL(local_icache_page_inv);
+
+void update_cache(struct vm_area_struct *vma, unsigned long address,
+ pte_t *pte)
+{
+ unsigned long pfn = pte_val(*pte) >> PAGE_SHIFT;
+ struct page *page = pfn_to_page(pfn);
+ int dirty = !test_and_set_bit(PG_dc_clean, &page->flags);
+
+ /*
+ * Since icaches do not snoop for updated data on OpenRISC, we
+ * must write back and invalidate any dirty pages manually. We
+ * can skip data pages, since they will not end up in icaches.
+ */
+ if ((vma->vm_flags & VM_EXEC) && dirty)
+ sync_icache_dcache(page);
+}
+