From 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 22 Oct 2024 10:36:11 +0000
Subject: [PATCH] 修改4g拨号为QMI,需要在系统里后台执行quectel-CM
---
kernel/arch/xtensa/mm/highmem.c | 50 +++++++++++++++++++++++++++++++++++++++++++-------
1 files changed, 43 insertions(+), 7 deletions(-)
diff --git a/kernel/arch/xtensa/mm/highmem.c b/kernel/arch/xtensa/mm/highmem.c
index 0735ca5..673196f 100644
--- a/kernel/arch/xtensa/mm/highmem.c
+++ b/kernel/arch/xtensa/mm/highmem.c
@@ -12,6 +12,8 @@
#include <linux/highmem.h>
#include <asm/tlbflush.h>
+static pte_t *kmap_pte;
+
#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];
@@ -31,25 +33,59 @@
static inline enum fixed_addresses kmap_idx(int type, unsigned long color)
{
- return (type + KM_MAX_IDX * smp_processor_id()) * DCACHE_N_COLORS +
+ return (type + KM_TYPE_NR * smp_processor_id()) * DCACHE_N_COLORS +
color;
}
-enum fixed_addresses kmap_local_map_idx(int type, unsigned long pfn)
+void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
{
- return kmap_idx(type, DCACHE_ALIAS(pfn << PAGE_SHIFT));
-}
+ enum fixed_addresses idx;
+ unsigned long vaddr;
-enum fixed_addresses kmap_local_unmap_idx(int type, unsigned long addr)
-{
- return kmap_idx(type, DCACHE_ALIAS(addr));
+ idx = kmap_idx(kmap_atomic_idx_push(),
+ DCACHE_ALIAS(page_to_phys(page)));
+ vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
+#ifdef CONFIG_DEBUG_HIGHMEM
+ BUG_ON(!pte_none(*(kmap_pte + idx)));
+#endif
+ set_pte(kmap_pte + idx, mk_pte(page, prot));
+
+ return (void *)vaddr;
}
+EXPORT_SYMBOL(kmap_atomic_high_prot);
+
+void kunmap_atomic_high(void *kvaddr)
+{
+ if (kvaddr >= (void *)FIXADDR_START &&
+ kvaddr < (void *)FIXADDR_TOP) {
+ int idx = kmap_idx(kmap_atomic_idx(),
+ DCACHE_ALIAS((unsigned long)kvaddr));
+
+ /*
+ * 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.
+ */
+ pte_clear(&init_mm, kvaddr, kmap_pte + idx);
+ local_flush_tlb_kernel_range((unsigned long)kvaddr,
+ (unsigned long)kvaddr + PAGE_SIZE);
+
+ kmap_atomic_idx_pop();
+ }
+}
+EXPORT_SYMBOL(kunmap_atomic_high);
void __init kmap_init(void)
{
+ unsigned long kmap_vstart;
+
/* Check if this memory layout is broken because PKMAP overlaps
* page table.
*/
BUILD_BUG_ON(PKMAP_BASE < TLBTEMP_BASE_1 + TLBTEMP_SIZE);
+ /* cache the first kmap pte */
+ kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
+ kmap_pte = virt_to_kpte(kmap_vstart);
kmap_waitqueues_init();
}
--
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