From 748e4f3d702def1a4bff191e0cf93b6a05340f01 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 10 May 2024 07:41:34 +0000
Subject: [PATCH] add gpio led uart
---
kernel/arch/xtensa/include/asm/processor.h | 63 +++++++++++++++++--------------
1 files changed, 35 insertions(+), 28 deletions(-)
diff --git a/kernel/arch/xtensa/include/asm/processor.h b/kernel/arch/xtensa/include/asm/processor.h
index 677bc76..9dd4efe 100644
--- a/kernel/arch/xtensa/include/asm/processor.h
+++ b/kernel/arch/xtensa/include/asm/processor.h
@@ -10,9 +10,10 @@
#ifndef _XTENSA_PROCESSOR_H
#define _XTENSA_PROCESSOR_H
-#include <variant/core.h>
+#include <asm/core.h>
#include <linux/compiler.h>
+#include <linux/stringify.h>
#include <asm/ptrace.h>
#include <asm/types.h>
#include <asm/regs.h>
@@ -156,14 +157,6 @@
int align[0] __attribute__ ((aligned(16)));
};
-
-/*
- * Default implementation of macro that returns current
- * instruction pointer ("program counter").
- */
-#define current_text_addr() ({ __label__ _l; _l: &&_l;})
-
-
/* This decides where the kernel will search for a free chunk of vm
* space during mmap's.
*/
@@ -183,26 +176,37 @@
/*
* Do necessary setup to start up a newly executed thread.
- * Note: We set-up ps as if we did a call4 to the new pc.
+ * Note: When windowed ABI is used for userspace we set-up ps
+ * as if we did a call4 to the new pc.
* set_thread_state in signal.c depends on it.
*/
-#define USER_PS_VALUE ((1 << PS_WOE_BIT) | \
+#if IS_ENABLED(CONFIG_USER_ABI_CALL0)
+#define USER_PS_VALUE ((USER_RING << PS_RING_SHIFT) | \
+ (1 << PS_UM_BIT) | \
+ (1 << PS_EXCM_BIT))
+#else
+#define USER_PS_VALUE (PS_WOE_MASK | \
(1 << PS_CALLINC_SHIFT) | \
(USER_RING << PS_RING_SHIFT) | \
(1 << PS_UM_BIT) | \
(1 << PS_EXCM_BIT))
+#endif
/* Clearing a0 terminates the backtrace. */
#define start_thread(regs, new_pc, new_sp) \
- memset(regs, 0, sizeof(*regs)); \
- regs->pc = new_pc; \
- regs->ps = USER_PS_VALUE; \
- regs->areg[1] = new_sp; \
- regs->areg[0] = 0; \
- regs->wmask = 1; \
- regs->depc = 0; \
- regs->windowbase = 0; \
- regs->windowstart = 1;
+ do { \
+ unsigned long syscall = (regs)->syscall; \
+ memset((regs), 0, sizeof(*(regs))); \
+ (regs)->pc = (new_pc); \
+ (regs)->ps = USER_PS_VALUE; \
+ (regs)->areg[1] = (new_sp); \
+ (regs)->areg[0] = 0; \
+ (regs)->wmask = 1; \
+ (regs)->depc = 0; \
+ (regs)->windowbase = 0; \
+ (regs)->windowstart = 1; \
+ (regs)->syscall = syscall; \
+ } while (0)
/* Forward declaration */
struct task_struct;
@@ -220,15 +224,18 @@
/* Special register access. */
-#define WSR(v,sr) __asm__ __volatile__ ("wsr %0,"__stringify(sr) :: "a"(v));
-#define RSR(v,sr) __asm__ __volatile__ ("rsr %0,"__stringify(sr) : "=a"(v));
+#define xtensa_set_sr(x, sr) \
+ ({ \
+ __asm__ __volatile__ ("wsr %0, "__stringify(sr) :: \
+ "a"((unsigned int)(x))); \
+ })
-#define set_sr(x,sr) ({unsigned int v=(unsigned int)x; WSR(v,sr);})
-#define get_sr(sr) ({unsigned int v; RSR(v,sr); v; })
-
-#ifndef XCHAL_HAVE_EXTERN_REGS
-#define XCHAL_HAVE_EXTERN_REGS 0
-#endif
+#define xtensa_get_sr(sr) \
+ ({ \
+ unsigned int v; \
+ __asm__ __volatile__ ("rsr %0, "__stringify(sr) : "=a"(v)); \
+ v; \
+ })
#if XCHAL_HAVE_EXTERN_REGS
--
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