From 297b60346df8beafee954a0fd7c2d64f33f3b9bc Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Sat, 11 May 2024 01:44:05 +0000
Subject: [PATCH] rtl8211F_led_control
---
kernel/arch/x86/mm/highmem_32.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 59 insertions(+), 0 deletions(-)
diff --git a/kernel/arch/x86/mm/highmem_32.c b/kernel/arch/x86/mm/highmem_32.c
index 2c54b76..075fe51 100644
--- a/kernel/arch/x86/mm/highmem_32.c
+++ b/kernel/arch/x86/mm/highmem_32.c
@@ -4,6 +4,65 @@
#include <linux/swap.h> /* for totalram_pages */
#include <linux/memblock.h>
+void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
+{
+ unsigned long vaddr;
+ int idx, type;
+
+ type = kmap_atomic_idx_push();
+ idx = type + KM_TYPE_NR*smp_processor_id();
+ vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
+ BUG_ON(!pte_none(*(kmap_pte-idx)));
+ set_pte(kmap_pte-idx, mk_pte(page, prot));
+ arch_flush_lazy_mmu_mode();
+
+ return (void *)vaddr;
+}
+EXPORT_SYMBOL(kmap_atomic_high_prot);
+
+/*
+ * This is the same as kmap_atomic() but can map memory that doesn't
+ * have a struct page associated with it.
+ */
+void *kmap_atomic_pfn(unsigned long pfn)
+{
+ return kmap_atomic_prot_pfn(pfn, kmap_prot);
+}
+EXPORT_SYMBOL_GPL(kmap_atomic_pfn);
+
+void kunmap_atomic_high(void *kvaddr)
+{
+ unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK;
+
+ if (vaddr >= __fix_to_virt(FIX_KMAP_END) &&
+ vaddr <= __fix_to_virt(FIX_KMAP_BEGIN)) {
+ int idx, type;
+
+ type = kmap_atomic_idx();
+ idx = type + KM_TYPE_NR * smp_processor_id();
+
+#ifdef CONFIG_DEBUG_HIGHMEM
+ WARN_ON_ONCE(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx));
+#endif
+ /*
+ * Force other mappings to Oops if they'll try to access this
+ * pte without first remap it. Keeping stale mappings around
+ * is a bad idea also, in case the page changes cacheability
+ * attributes or becomes a protected page in a hypervisor.
+ */
+ kpte_clear_flush(kmap_pte-idx, vaddr);
+ kmap_atomic_idx_pop();
+ arch_flush_lazy_mmu_mode();
+ }
+#ifdef CONFIG_DEBUG_HIGHMEM
+ else {
+ BUG_ON(vaddr < PAGE_OFFSET);
+ BUG_ON(vaddr >= (unsigned long)high_memory);
+ }
+#endif
+}
+EXPORT_SYMBOL(kunmap_atomic_high);
+
void __init set_highmem_pages_init(void)
{
struct zone *zone;
--
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