[Feature] add GA346 baseline version
Change-Id: Ic62933698569507dcf98240cdf5d9931ae34348f
diff --git a/src/kernel/linux/v4.19/arch/nds32/mm/highmem.c b/src/kernel/linux/v4.19/arch/nds32/mm/highmem.c
new file mode 100644
index 0000000..e17cb8a
--- /dev/null
+++ b/src/kernel/linux/v4.19/arch/nds32/mm/highmem.c
@@ -0,0 +1,79 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/export.h>
+#include <linux/highmem.h>
+#include <linux/sched.h>
+#include <linux/smp.h>
+#include <linux/interrupt.h>
+#include <linux/bootmem.h>
+#include <asm/fixmap.h>
+#include <asm/tlbflush.h>
+
+void *kmap(struct page *page)
+{
+ unsigned long vaddr;
+ might_sleep();
+ if (!PageHighMem(page))
+ return page_address(page);
+ vaddr = (unsigned long)kmap_high(page);
+ return (void *)vaddr;
+}
+
+EXPORT_SYMBOL(kmap);
+
+void kunmap(struct page *page)
+{
+ BUG_ON(in_interrupt());
+ if (!PageHighMem(page))
+ return;
+ kunmap_high(page);
+}
+
+EXPORT_SYMBOL(kunmap);
+
+void *kmap_atomic(struct page *page)
+{
+ unsigned int idx;
+ unsigned long vaddr, pte;
+ int type;
+ pte_t *ptep;
+
+ preempt_disable();
+ pagefault_disable();
+ if (!PageHighMem(page))
+ return page_address(page);
+
+ type = kmap_atomic_idx_push();
+
+ idx = type + KM_TYPE_NR * smp_processor_id();
+ vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
+ pte = (page_to_pfn(page) << PAGE_SHIFT) | (PAGE_KERNEL);
+ ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr);
+ set_pte(ptep, pte);
+
+ __nds32__tlbop_inv(vaddr);
+ __nds32__mtsr_dsb(vaddr, NDS32_SR_TLB_VPN);
+ __nds32__tlbop_rwr(pte);
+ __nds32__isb();
+ return (void *)vaddr;
+}
+
+EXPORT_SYMBOL(kmap_atomic);
+
+void __kunmap_atomic(void *kvaddr)
+{
+ if (kvaddr >= (void *)FIXADDR_START) {
+ unsigned long vaddr = (unsigned long)kvaddr;
+ pte_t *ptep;
+ kmap_atomic_idx_pop();
+ __nds32__tlbop_inv(vaddr);
+ __nds32__isb();
+ ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr);
+ set_pte(ptep, 0);
+ }
+ pagefault_enable();
+ preempt_enable();
+}
+
+EXPORT_SYMBOL(__kunmap_atomic);