xtensa: move headers files to arch/xtensa/include

Move all header files for xtensa to arch/xtensa/include and platform and
variant header files to the appropriate arch/xtensa/platforms/ and
arch/xtensa/variants/ directories.

Moving the files gets also rid of all uses of symlinks in the Makefile.

This has been completed already for the majority of the architectures
and xtensa is one out of six missing.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Chris Zankel <chris@zankel.net>

1 files changed, 193 insertions, 0 deletions

diff --git a/arch/xtensa/include/asm/processor.h b/arch/xtensa/include/asm/processor.h
new file mode 100644
index 000000000000..07387d3b99f4
--- /dev/null
+++ b/arch/xtensa/include/asm/processor.h
@@ -0,0 +1,193 @@
+/*
+ * include/asm-xtensa/processor.h
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2001 - 2005 Tensilica Inc.
+ */
+
+#ifndef _XTENSA_PROCESSOR_H
+#define _XTENSA_PROCESSOR_H
+
+#include <variant/core.h>
+#include <asm/coprocessor.h>
+
+#include <linux/compiler.h>
+#include <asm/ptrace.h>
+#include <asm/types.h>
+#include <asm/regs.h>
+
+/* Assertions. */
+
+#if (XCHAL_HAVE_WINDOWED != 1)
+# error Linux requires the Xtensa Windowed Registers Option.
+#endif
+
+/*
+ * User space process size: 1 GB.
+ * Windowed call ABI requires caller and callee to be located within the same
+ * 1 GB region. The C compiler places trampoline code on the stack for sources
+ * that take the address of a nested C function (a feature used by glibc), so
+ * the 1 GB requirement applies to the stack as well.
+ */
+
+#define TASK_SIZE       __XTENSA_UL_CONST(0x40000000)
+#define STACK_TOP       TASK_SIZE
+#define STACK_TOP_MAX   STACK_TOP
+
+/*
+ * General exception cause assigned to debug exceptions. Debug exceptions go
+ * to their own vector, rather than the general exception vectors (user,
+ * kernel, double); and their specific causes are reported via DEBUGCAUSE
+ * rather than EXCCAUSE.  However it is sometimes convenient to redirect debug
+ * exceptions to the general exception mechanism.  To do this, an otherwise
+ * unused EXCCAUSE value was assigned to debug exceptions for this purpose.
+ */
+
+#define EXCCAUSE_MAPPED_DEBUG   63
+
+/*
+ * We use DEPC also as a flag to distinguish between double and regular
+ * exceptions. For performance reasons, DEPC might contain the value of
+ * EXCCAUSE for regular exceptions, so we use this definition to mark a
+ * valid double exception address.
+ * (Note: We use it in bgeui, so it should be 64, 128, or 256)
+ */
+
+#define VALID_DOUBLE_EXCEPTION_ADDRESS  64
+
+/* LOCKLEVEL defines the interrupt level that masks all
+ * general-purpose interrupts.
+ */
+#define LOCKLEVEL 1
+
+/* WSBITS and WBBITS are the width of the WINDOWSTART and WINDOWBASE
+ * registers
+ */
+#define WSBITS  (XCHAL_NUM_AREGS / 4)      /* width of WINDOWSTART in bits */
+#define WBBITS  (XCHAL_NUM_AREGS_LOG2 - 2) /* width of WINDOWBASE in bits */
+
+#ifndef __ASSEMBLY__
+
+/* Build a valid return address for the specified call winsize.
+ * winsize must be 1 (call4), 2 (call8), or 3 (call12)
+ */
+#define MAKE_RA_FOR_CALL(ra,ws)   (((ra) & 0x3fffffff) | (ws) << 30)
+
+/* Convert return address to a valid pc
+ * Note: We assume that the stack pointer is in the same 1GB ranges as the ra
+ */
+#define MAKE_PC_FROM_RA(ra,sp)    (((ra) & 0x3fffffff) | ((sp) & 0xc0000000))
+
+typedef struct {
+    unsigned long seg;
+} mm_segment_t;
+
+struct thread_struct {
+
+        /* kernel's return address and stack pointer for context switching */
+        unsigned long ra; /* kernel's a0: return address and window call size */
+        unsigned long sp; /* kernel's a1: stack pointer */
+
+        mm_segment_t current_ds;    /* see uaccess.h for example uses */
+
+        /* struct xtensa_cpuinfo info; */
+
+        unsigned long bad_vaddr; /* last user fault */
+        unsigned long bad_uaddr; /* last kernel fault accessing user space */
+        unsigned long error_code;
+
+        unsigned long ibreak[XCHAL_NUM_IBREAK];
+        unsigned long dbreaka[XCHAL_NUM_DBREAK];
+        unsigned long dbreakc[XCHAL_NUM_DBREAK];
+
+        /* Make structure 16 bytes aligned. */
+        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.
+ */
+#define TASK_UNMAPPED_BASE      (TASK_SIZE / 2)
+
+#define INIT_THREAD  \
+{                                                                       \
+        ra:             0,                                              \
+        sp:             sizeof(init_stack) + (long) &init_stack,        \
+        current_ds:     {0},                                            \
+        /*info:         {0}, */                                         \
+        bad_vaddr:      0,                                              \
+        bad_uaddr:      0,                                              \
+        error_code:     0,                                              \
+}
+
+
+/*
+ * 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.
+ *       set_thread_state in signal.c depends on it.
+ */
+#define USER_PS_VALUE ((1 << PS_WOE_BIT) |                              \
+                       (1 << PS_CALLINC_SHIFT) |                        \
+                       (USER_RING << PS_RING_SHIFT) |                   \
+                       (1 << PS_UM_BIT) |                               \
+                       (1 << PS_EXCM_BIT))
+
+/* Clearing a0 terminates the backtrace. */
+#define start_thread(regs, new_pc, new_sp) \
+        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;
+
+/* Forward declaration */
+struct task_struct;
+struct mm_struct;
+
+/* Free all resources held by a thread. */
+#define release_thread(thread) do { } while(0)
+
+/* Prepare to copy thread state - unlazy all lazy status */
+extern void prepare_to_copy(struct task_struct*);
+
+/* Create a kernel thread without removing it from tasklists */
+extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
+
+/* Copy and release all segment info associated with a VM */
+#define copy_segments(p, mm)    do { } while(0)
+#define release_segments(mm)    do { } while(0)
+#define forget_segments()       do { } while (0)
+
+#define thread_saved_pc(tsk)    (task_pt_regs(tsk)->pc)
+
+extern unsigned long get_wchan(struct task_struct *p);
+
+#define KSTK_EIP(tsk)           (task_pt_regs(tsk)->pc)
+#define KSTK_ESP(tsk)           (task_pt_regs(tsk)->areg[1])
+
+#define cpu_relax()  barrier()
+
+/* 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 set_sr(x,sr) ({unsigned int v=(unsigned int)x; WSR(v,sr);})
+#define get_sr(sr) ({unsigned int v; RSR(v,sr); v; })
+
+#endif  /* __ASSEMBLY__ */
+#endif  /* _XTENSA_PROCESSOR_H */