* invalidate any other reasons why the executable file might be covered by
* the GNU General Public License.
*
- * Copyright 2004, 2005, 2006, 2007 Develer S.r.l. (http://www.develer.com/)
+ * Copyright 2004, 2005, 2006, 2007, 2008 Develer S.r.l. (http://www.develer.com/)
* Copyright 2004 Giovanni Bajo
- *
* -->
*
* \brief CPU-specific attributes.
*
* \author Giovanni Bajo <rasky@develer.com>
- * \author Bernardo Innocenti <bernie@develer.com>
+ * \author Bernie Innocenti <bernie@codewiz.org>
* \author Stefano Fedrigo <aleph@develer.com>
* \author Francesco Sacchi <batt@develer.com>
*/
#include "detect.h"
+#include "cfg/cfg_proc.h" /* CONFIG_KERN_PREEMPT */
#include "cfg/cfg_attr.h" /* CONFIG_FAST_MEM */
-#include "cfg/cfg_arch.h" /* ARCH_EMUL */
-#include <cfg/compiler.h> /* for uintXX_t */
/**
#define CPU_REG_BITS 16
#define CPU_REGS_CNT 16
- #define CPU_STACK_GROWS_UPWARD 0
- #define CPU_SP_ON_EMPTY_SLOT 0
#define CPU_BYTE_ORDER CPU_LITTLE_ENDIAN
- #define CPU_HARVARD 0
+ #define CPU_HARVARD 0
-#elif CPU_X86
+ /// Valid pointers should be >= than this value (used for debug)
+ #define CPU_RAM_START 0x100
- #define NOP asm volatile ("nop")
+#elif CPU_X86
#define CPU_REGS_CNT 7
- #define CPU_SAVED_REGS_CNT 7
- #define CPU_STACK_GROWS_UPWARD 0
- #define CPU_SP_ON_EMPTY_SLOT 0
#define CPU_BYTE_ORDER CPU_LITTLE_ENDIAN
- #define CPU_HARVARD 0
+ #define CPU_HARVARD 0
#if CPU_X86_64
#define CPU_REG_BITS 64
#define CPU_REG_BITS 32
#endif
+ /// Valid pointers should be >= than this value (used for debug)
+ #define CPU_RAM_START 0x1000
+
+ #ifdef __GNUC__
+ #define NOP asm volatile ("nop")
+ /* This is a good thing to insert into busy-wait loops. */
+ #define PAUSE asm volatile ("rep; nop" ::: "memory")
+ #define BREAKPOINT asm volatile ("int3" ::)
+ #endif
+
#elif CPU_ARM
- /* Register counts include SREG too */
#define CPU_REG_BITS 32
#define CPU_REGS_CNT 16
- #define CPU_SAVED_REGS_CNT 9
- #define CPU_STACK_GROWS_UPWARD 0
- #define CPU_SP_ON_EMPTY_SLOT 0
#define CPU_HARVARD 0
+ /// Valid pointers should be >= than this value (used for debug)
+ #if CPU_ARM_AT91
+ #define CPU_RAM_START 0x00200000
+ #else
+ #warning Fix CPU_RAM_START address for your ARM, default value set to 0x200
+ #define CPU_RAM_START 0x200
+ #endif
+
#ifdef __IAR_SYSTEMS_ICC__
#warning Check CPU_BYTE_ORDER
#define CPU_BYTE_ORDER (__BIG_ENDIAN__ ? CPU_BIG_ENDIAN : CPU_LITTLE_ENDIAN)
#else /* GCC and compatibles */
#if defined(__ARMEB__)
- #define CPU_BYTE_ORDER CPU_BIG_ENDIAN
- #elif defined(__ARMEL__)
- #define CPU_BYTE_ORDER CPU_LITTLE_ENDIAN
+ #define CPU_BYTE_ORDER CPU_BIG_ENDIAN
+ #elif defined(__ARMEL__)
+ #define CPU_BYTE_ORDER CPU_LITTLE_ENDIAN
#else
#error Unable to detect ARM endianness!
#endif
#define NOP asm volatile ("mov r0,r0" ::)
-
- /**
- * Initialization value for registers in stack frame.
- * The register index is not directly corrispondent to CPU
- * register numbers, but is related to how are pushed to
- * stack (\see asm_switch_context).
- * Index (CPU_SAVED_REGS_CNT - 1) is the CPSR register,
- * the initial value is set to:
- * - All flags (N, Z, C, V) set to 0.
- * - IRQ and FIQ enabled.
- * - ARM state.
- * - CPU in Supervisor Mode (SVC).
- */
- #define CPU_REG_INIT_VALUE(reg) (reg == (CPU_SAVED_REGS_CNT - 1) ? 0x13 : 0)
+ #define BREAKPOINT /* asm("bkpt 0") DOES NOT WORK */
#if CONFIG_FAST_MEM
/**
#define FAST_FUNC /**/
#endif
- /**
- * Function attribute to declare an interrupt service routine.
+ /*
+ * Function attribute to move it into ram memory.
*/
- #define ISR_FUNC __attribute__((interrupt))
+ #define RAM_FUNC __attribute__((section(".data")))
#endif /* !__IAR_SYSTEMS_ICC_ */
#elif CPU_PPC
- #define NOP asm volatile ("nop" ::)
- /* Register counts include SREG too */
#define CPU_REG_BITS (CPU_PPC32 ? 32 : 64)
#define CPU_REGS_CNT FIXME
- #define CPU_SAVED_REGS_CNT FIXME
- #define CPU_STACK_GROWS_UPWARD 0 //FIXME
- #define CPU_SP_ON_EMPTY_SLOT 0 //FIXME
#define CPU_BYTE_ORDER (__BIG_ENDIAN__ ? CPU_BIG_ENDIAN : CPU_LITTLE_ENDIAN)
#define CPU_HARVARD 0
-#elif CPU_DSP56K
+ /// Valid pointers should be >= than this value (used for debug)
+ #define CPU_RAM_START 0x1000
- #define NOP asm(nop)
+ #ifdef __GNUC__
+ #define NOP asm volatile ("nop" ::)
+ #define BREAKPOINT asm volatile ("twge 2,2" ::)
+ #endif
+
+#elif CPU_DSP56K
#define CPU_REG_BITS 16
#define CPU_REGS_CNT FIXME
- #define CPU_SAVED_REGS_CNT 8
- #define CPU_STACK_GROWS_UPWARD 1
- #define CPU_SP_ON_EMPTY_SLOT 0
#define CPU_BYTE_ORDER CPU_BIG_ENDIAN
#define CPU_HARVARD 1
#define SIZEOF_LONG 2
#define SIZEOF_PTR 1
+ /// Valid pointers should be >= than this value (used for debug)
+ #define CPU_RAM_START 0x200
+
+ #define NOP asm(nop)
+ #define BREAKPOINT asm(debug)
+
#elif CPU_AVR
- #define NOP asm volatile ("nop" ::)
+ #define NOP asm volatile ("nop" ::)
- /* Register counts include SREG too */
#define CPU_REG_BITS 8
- #define CPU_REGS_CNT 33
- #define CPU_SAVED_REGS_CNT 19
- #define CPU_STACK_GROWS_UPWARD 0
- #define CPU_SP_ON_EMPTY_SLOT 1
+ #define CPU_REGS_CNT 33 /* Includes SREG */
#define CPU_BYTE_ORDER CPU_LITTLE_ENDIAN
#define CPU_HARVARD 1
- /**
- * Initialization value for registers in stack frame.
- * The register index is not directly corrispondent to CPU
- * register numbers. Index 0 is the SREG register: the initial
- * value is all 0 but the interrupt bit (bit 7).
- */
- #define CPU_REG_INIT_VALUE(reg) (reg == 0 ? 0x80 : 0)
+ /// Valid pointers should be >= than this value (used for debug)
+ #if CPU_AVR_ATMEGA8 || CPU_AVR_ATMEGA32 || CPU_AVR_ATMEGA103
+ #define CPU_RAM_START 0x60
+ #elif CPU_AVR_ATMEGA64 || CPU_AVR_ATMEGA128 || CPU_AVR_ATMEGA168
+ #define CPU_RAM_START 0x100
+ #elif CPU_AVR_ATMEGA1281
+ #define CPU_RAM_START 0x200
+ #else
+ #warning Fix CPU_RAM_START address for your AVR, default value set to 0x100
+ #define CPU_RAM_START 0x100
+ #endif
#else
#error No CPU_... defined.
#endif
-/// Default for macro not defined in the right arch section
-#ifndef CPU_REG_INIT_VALUE
- #define CPU_REG_INIT_VALUE(reg) 0
-#endif
-
-#ifndef CPU_STACK_GROWS_UPWARD
- #error CPU_STACK_GROWS_UPWARD should have been defined to either 0 or 1
-#endif
-
-#ifndef CPU_SP_ON_EMPTY_SLOT
- #error CPU_SP_ON_EMPTY_SLOT should have been defined to either 0 or 1
+#ifndef BREAKPOINT
+#define BREAKPOINT /* nop */
#endif
#ifndef FAST_FUNC
- /**
- * Function attribute for use with performance critical code.
- */
+ /// Function attribute for use with performance critical code.
#define FAST_FUNC /* */
#endif
#ifndef FAST_RODATA
- /**
- * Data attribute to move constant data to fast memory storage.
- */
+ /// Data attribute to move constant data to fast memory storage.
#define FAST_RODATA /* */
#endif
-/*
- * Support stack handling peculiarities of a few CPUs.
- *
- * Most processors let their stack grow downward and
- * keep SP pointing at the last pushed value.
- */
-#if !CPU_STACK_GROWS_UPWARD
- #if !CPU_SP_ON_EMPTY_SLOT
- /* Most microprocessors (x86, m68k...) */
- #define CPU_PUSH_WORD(sp, data) \
- do { *--(sp) = (data); } while (0)
- #define CPU_POP_WORD(sp) \
- (*(sp)++)
- #else
- /* AVR insanity */
- #define CPU_PUSH_WORD(sp, data) \
- do { *(sp)-- = (data); } while (0)
- #define CPU_POP_WORD(sp) \
- (*++(sp))
- #endif
-
-#else /* CPU_STACK_GROWS_UPWARD */
-
- #if !CPU_SP_ON_EMPTY_SLOT
- /* DSP56K and other weirdos */
- #define CPU_PUSH_WORD(sp, data) \
- do { *++(sp) = (cpustack_t)(data); } while (0)
- #define CPU_POP_WORD(sp) \
- (*(sp)--)
- #else
- #error I bet you cannot find a CPU like this
- #endif
-#endif
-
-
-#if CPU_DSP56K
- /*
- * DSP56k pushes both PC and SR to the stack in the JSR instruction, but
- * RTS discards SR while returning (it does not restore it). So we push
- * 0 to fake the same context.
- */
- #define CPU_PUSH_CALL_CONTEXT(sp, func) \
- do { \
- CPU_PUSH_WORD((sp), (func)); \
- CPU_PUSH_WORD((sp), 0x100); \
- } while (0);
-
-#elif CPU_AVR
- /*
- * In AVR, the addresses are pushed into the stack as little-endian, while
- * memory accesses are big-endian (actually, it's a 8-bit CPU, so there is
- * no natural endianess).
- */
- #define CPU_PUSH_CALL_CONTEXT(sp, func) \
- do { \
- uint16_t funcaddr = (uint16_t)(func); \
- CPU_PUSH_WORD((sp), funcaddr); \
- CPU_PUSH_WORD((sp), funcaddr>>8); \
- } while (0)
-
- /*
- * If the kernel is in idle-spinning, the processor executes:
- *
- * IRQ_ENABLE;
- * CPU_IDLE;
- * IRQ_DISABLE;
- *
- * IRQ_ENABLE is translated in asm as "sei" and IRQ_DISABLE as "cli".
- * We could define CPU_IDLE to expand to none, so the resulting
- * asm code would be:
- *
- * sei;
- * cli;
- *
- * But Atmel datasheet states:
- * "When using the SEI instruction to enable interrupts,
- * the instruction following SEI will be executed *before*
- * any pending interrupts", so "cli" is executed before any
- * pending interrupt with the result that IRQs will *NOT*
- * be enabled!
- * To ensure that IRQ will run a NOP is required.
- */
- #define CPU_IDLE NOP
-
-#else
- #define CPU_PUSH_CALL_CONTEXT(sp, func) \
- CPU_PUSH_WORD((sp), (cpustack_t)(func))
+#ifndef PAUSE
+ /// Generic PAUSE implementation.
+ #define PAUSE {NOP; MEMORY_BARRIER;}
#endif
-/**
- * \def CPU_IDLE
- *
- * \brief Invoked by the scheduler to stop the CPU when idle.
- *
- * This hook can be redefined to put the CPU in low-power mode, or to
- * profile system load with an external strobe, or to save CPU cycles
- * in hosted environments such as emulators.
- */
-#ifndef CPU_IDLE
- #if defined(ARCH_EMUL) && (ARCH & ARCH_EMUL)
- /* This emulator hook should yield the CPU to the host. */
- EXTERN_C_BEGIN
- void emul_idle(void);
- EXTERN_C_END
- #define CPU_IDLE emul_idle()
- #else /* !ARCH_EMUL */
- #define CPU_IDLE do { /* nothing */ } while (0)
- #endif /* !ARCH_EMUL */
-#endif /* !CPU_IDLE */
-
#endif /* CPU_ATTR_H */
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