change otg to host mode

hc

2024-05-11 04dd17822334871b23ea2862f7798fb0e0007777

 kernel/arch/x86/include/asm/xen/page.h
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..
@@ -9,9 +9,8 @@
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 #include <linux/mm.h>
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 #include <linux/device.h>
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-#include <linux/uaccess.h>
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+#include <asm/extable.h>
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 #include <asm/page.h>
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-#include <asm/pgtable.h>
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 #include <xen/interface/xen.h>
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 #include <xen/interface/grant_table.h>
..
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@@ -93,12 +92,39 @@
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  */
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 static inline int xen_safe_write_ulong(unsigned long *addr, unsigned long val)
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 {
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-	return __put_user(val, (unsigned long __user *)addr);
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+	int ret = 0;
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+
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+	asm volatile("1: mov %[val], %[ptr]\n"
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+		     "2:\n"
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+		     ".section .fixup, \"ax\"\n"
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+		     "3: sub $1, %[ret]\n"
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+		     "   jmp 2b\n"
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+		     ".previous\n"
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+		     _ASM_EXTABLE(1b, 3b)
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+		     : [ret] "+r" (ret), [ptr] "=m" (*addr)
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+		     : [val] "r" (val));
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+
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+	return ret;
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 }
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-static inline int xen_safe_read_ulong(unsigned long *addr, unsigned long *val)
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+static inline int xen_safe_read_ulong(const unsigned long *addr,
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+				      unsigned long *val)
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 {
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-	return __get_user(*val, (unsigned long __user *)addr);
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+	int ret = 0;
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+	unsigned long rval = ~0ul;
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+
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+	asm volatile("1: mov %[ptr], %[rval]\n"
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+		     "2:\n"
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+		     ".section .fixup, \"ax\"\n"
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+		     "3: sub $1, %[ret]\n"
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+		     "   jmp 2b\n"
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+		     ".previous\n"
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+		     _ASM_EXTABLE(1b, 3b)
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+		     : [ret] "+r" (ret), [rval] "+r" (rval)
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+		     : [ptr] "m" (*addr));
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+	*val = rval;
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+
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+	return ret;
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 }
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 #ifdef CONFIG_XEN_PV