From b22da3d8526a935aa31e086e63f60ff3246cb61c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Sat, 09 Dec 2023 07:24:11 +0000
Subject: [PATCH] add stmac read mac form eeprom
---
kernel/arch/um/kernel/skas/uaccess.c | 34 +++++++++++++++++++---------------
1 files changed, 19 insertions(+), 15 deletions(-)
diff --git a/kernel/arch/um/kernel/skas/uaccess.c b/kernel/arch/um/kernel/skas/uaccess.c
index d450797..2dec915 100644
--- a/kernel/arch/um/kernel/skas/uaccess.c
+++ b/kernel/arch/um/kernel/skas/uaccess.c
@@ -1,6 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
- * Licensed under the GPL
*/
#include <linux/err.h>
@@ -10,13 +10,13 @@
#include <linux/sched.h>
#include <asm/current.h>
#include <asm/page.h>
-#include <asm/pgtable.h>
#include <kern_util.h>
#include <os.h>
pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr)
{
pgd_t *pgd;
+ p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
@@ -27,7 +27,11 @@
if (!pgd_present(*pgd))
return NULL;
- pud = pud_offset(pgd, addr);
+ p4d = p4d_offset(pgd, addr);
+ if (!p4d_present(*p4d))
+ return NULL;
+
+ pud = pud_offset(p4d, addr);
if (!pud_present(*pud))
return NULL;
@@ -59,30 +63,30 @@
static int do_op_one_page(unsigned long addr, int len, int is_write,
int (*op)(unsigned long addr, int len, void *arg), void *arg)
{
- jmp_buf buf;
struct page *page;
pte_t *pte;
- int n, faulted;
+ int n;
pte = maybe_map(addr, is_write);
if (pte == NULL)
return -1;
page = pte_page(*pte);
+#ifdef CONFIG_64BIT
+ pagefault_disable();
+ addr = (unsigned long) page_address(page) +
+ (addr & ~PAGE_MASK);
+#else
addr = (unsigned long) kmap_atomic(page) +
(addr & ~PAGE_MASK);
+#endif
+ n = (*op)(addr, len, arg);
- current->thread.fault_catcher = &buf;
-
- faulted = UML_SETJMP(&buf);
- if (faulted == 0)
- n = (*op)(addr, len, arg);
- else
- n = -1;
-
- current->thread.fault_catcher = NULL;
-
+#ifdef CONFIG_64BIT
+ pagefault_enable();
+#else
kunmap_atomic((void *)addr);
+#endif
return n;
}
--
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