/*
* HP PA-RISC CPU Dependent Source
*
*
* To anyone who acknowledges that this file is provided "AS IS"
* without any express or implied warranty:
* permission to use, copy, modify, and distribute this file
* for any purpose is hereby granted without fee, provided that
* the above copyright notice and this notice appears in all
* copies, and that the name of Division Incorporated not be
* used in advertising or publicity pertaining to distribution
* of the software without specific, written prior permission.
* Division Incorporated makes no representations about the
* suitability of this software for any purpose.
*
* $Id$
*/
#include <rtems/system.h>
#include <rtems/fatal.h>
#include <rtems/isr.h>
#include <rtems/wkspace.h>
/*
* In order to get the types and prototypes used in this file under
* Solaris 2.3, it is necessary to pull the following magic.
*/
#if defined(solaris)
#warning "Ignore the undefining __STDC__ warning"
#undef __STDC__
#define __STDC__ 0
#undef _POSIX_C_SOURCE
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <time.h>
extern void set_vector(proc_ptr, int, int);
extern void _Thread_Dispatch(void);
extern unsigned32 _Thread_Dispatch_disable_level;
extern unsigned32 _SYSTEM_ID;
extern boolean _Context_Switch_necessary;
rtems_status_code signal_initialize(void);
void Stray_signal(int);
void signal_enable(unsigned32);
void signal_disable(unsigned32);
void interrupt_handler();
sigset_t UNIX_SIGNAL_MASK;
jmp_buf default_context;
/*
* Which cpu are we? Used by libcpu and libbsp.
*/
int cpu_number;
/* _CPU_Initialize
*
* This routine performs processor dependent initialization.
*
* INPUT PARAMETERS:
* cpu_table - CPU table to initialize
* thread_dispatch - address of disptaching routine
*/
void _CPU_Initialize(
rtems_cpu_table *cpu_table,
void (*thread_dispatch) /* ignored on this CPU */
)
{
unsigned32 i;
if ( cpu_table == NULL )
rtems_fatal_error_occurred( RTEMS_NOT_CONFIGURED );
/*
* The thread_dispatch argument is the address of the entry point
* for the routine called at the end of an ISR once it has been
* decided a context switch is necessary. On some compilation
* systems it is difficult to call a high-level language routine
* from assembly. This allows us to trick these systems.
*
* If you encounter this problem save the entry point in a CPU
* dependent variable.
*/
_CPU_Thread_dispatch_pointer = thread_dispatch;
/*
* XXX; If there is not an easy way to initialize the FP context
* during Context_Initialize, then it is usually easier to
* save an "uninitialized" FP context here and copy it to
* the task's during Context_Initialize.
*/
/* XXX: FP context initialization support */
_CPU_Table = *cpu_table;
#if defined(hppa1_1) && defined(RTEMS_UNIXLIB)
/*
* HACK - set the _SYSTEM_ID to 0x20c so that setjmp/longjmp
* will handle the full 32 floating point registers.
*
* NOTE: Is this a bug in HPUX9?
*/
_SYSTEM_ID = 0x20c;
#endif
/*
* get default values to use in _CPU_Context_Initialize()
*/
setjmp(default_context);
/*
* Block all the signals except SIGTRAP for the debugger
* and SIGABRT for fatal errors.
*/
_CPU_ISR_Set_signal_level(1);
sigfillset(&UNIX_SIGNAL_MASK);
sigdelset(&UNIX_SIGNAL_MASK, SIGTRAP);
sigdelset(&UNIX_SIGNAL_MASK, SIGABRT);
sigdelset(&UNIX_SIGNAL_MASK, SIGIOT);
sigdelset(&UNIX_SIGNAL_MASK, SIGCONT);
sigprocmask(SIG_BLOCK, &UNIX_SIGNAL_MASK, 0);
/*
* Set the handler for all signals to be signal_handler
* which will then vector out to the correct handler
* for whichever signal actually happened. Initially
* set the vectors to the stray signal handler.
*/
for (i = 0; i < 32; i++)
(void)set_vector(Stray_signal, i, 1);
signal_initialize();
}
/* _CPU_ISR_install_vector
*
* This kernel routine installs the RTEMS handler for the
* specified vector.
*
* Input parameters:
* vector - interrupt vector number
* old_handler - former ISR for this vector number
* new_handler - replacement ISR for this vector number
*
* Output parameters: NONE
*
*/
void _CPU_ISR_install_vector(
unsigned32 vector,
proc_ptr new_handler,
proc_ptr *old_handler
)
{
*old_handler = _ISR_Vector_table[ vector ];
/*
* If the interrupt vector table is a table of pointer to isr entry
* points, then we need to install the appropriate RTEMS interrupt
* handler for this vector number.
*/
/*
* We put the actual user ISR address in '_ISR_vector_table'. This will
* be used by the _ISR_Handler so the user gets control.
*/
_ISR_Vector_table[ vector ] = new_handler;
}
/*PAGE
*
* _CPU_Install_interrupt_stack
*/
void _CPU_Install_interrupt_stack( void )
{
}
/*PAGE
*
* _CPU_Internal_threads_Idle_thread_body
*
* NOTES:
*
* 1. This is the same as the regular CPU independent algorithm.
*
* 2. If you implement this using a "halt", "idle", or "shutdown"
* instruction, then don't forget to put it in an infinite loop.
*
* 3. Be warned. Some processors with onboard DMA have been known
* to stop the DMA if the CPU were put in IDLE mode. This might
* also be a problem with other on-chip peripherals. So use this
* hook with caution.
*/
void _CPU_Internal_threads_Idle_thread_body( void )
{
while (1)
pause();
}
void _CPU_Context_Initialize(
Context_Control *_the_context,
unsigned32 *_stack_base,
unsigned32 _size,
unsigned32 _new_level,
void *_entry_point
)
{
unsigned32 *addr;
unsigned32 jmp_addr;
unsigned32 _stack_low; /* lowest "stack aligned" address */
unsigned32 _stack_high; /* highest "stack aligned" address */
unsigned32 _the_size;
jmp_addr = (unsigned32) _entry_point;
/*
* On CPUs with stacks which grow down, we build the stack
* based on the _stack_high address. On CPUs with stacks which
* grow up, we build the stack based on the _stack_low address.
*/
_stack_low = ((unsigned32)(_stack_base) + CPU_STACK_ALIGNMENT);
_stack_low &= ~(CPU_STACK_ALIGNMENT - 1);
_stack_high = ((unsigned32)(_stack_base) + _size);
_stack_high &= ~(CPU_STACK_ALIGNMENT - 1);
_the_size = _size & ~(CPU_STACK_ALIGNMENT - 1);
/*
* Slam our jmp_buf template into the context we are creating
*/
memcpy(_the_context, default_context, sizeof(jmp_buf));
addr = (unsigned32 *)_the_context;
#if defined(hppa1_1)
*(addr + RP_OFF) = jmp_addr;
*(addr + SP_OFF) = (unsigned32)(_stack_low + CPU_FRAME_SIZE);
/*
* See if we are using shared libraries by checking
* bit 30 in 24 off of newp. If bit 30 is set then
* we are using shared libraries and the jump address
* is at what 24 off of newp points to so shove that
* into 24 off of newp instead.
*/
if (jmp_addr & 0x40000000) {
jmp_addr &= 0xfffffffc;
*(addr + RP_OFF) = (unsigned32)*(unsigned32 *)jmp_addr;
}
#elif defined(sparc)
/*
* See /usr/include/sys/stack.h in Solaris 2.3 for a nice
* diagram of the stack.
*/
asm ("ta 0x03"); /* flush registers */
*(addr + RP_OFF) = jmp_addr + ADDR_ADJ_OFFSET;
*(addr + SP_OFF) = (unsigned32)(_stack_high - CPU_FRAME_SIZE);
*(addr + FP_OFF) = (unsigned32)(_stack_high);
#else
#error "UNKNOWN CPU!!!"
#endif
if (_new_level)
_CPU_ISR_Set_signal_level(1);
else
_CPU_ISR_Set_signal_level(0);
}
void _CPU_Context_restore(
Context_Control *next
)
{
longjmp(next->regs, 0);
}
void _CPU_Context_switch(
Context_Control *current,
Context_Control *next
)
{
/*
* Save the current context
*/
if (setjmp(current->regs) == 0) {
/*
* Switch to the new context
*/
longjmp(next->regs, 0);
}
}
void _CPU_Save_float_context(
Context_Control_fp *fp_context
)
{
}
void _CPU_Restore_float_context(
Context_Control_fp *fp_context
)
{
}
void _CPU_ISR_Set_signal_level(unsigned32 level)
{
if (level)
_CPU_Disable_signal();
else
_CPU_Enable_signal(0);
}
unsigned32 _CPU_Disable_signal(void)
{
sigset_t old_mask;
sigset_t empty_mask;
sigemptyset(&empty_mask);
sigemptyset(&old_mask);
sigprocmask(SIG_BLOCK, &UNIX_SIGNAL_MASK, &old_mask);
if (memcmp((char *)&empty_mask, (char *)&old_mask, sizeof(sigset_t)) != 0)
return 1;
return 0;
}
void _CPU_Enable_signal(unsigned32 level)
{
if (level == 0)
sigprocmask(SIG_UNBLOCK, &UNIX_SIGNAL_MASK, 0);
}
/*
* Support for external and spurious interrupts on HPPA
*
* TODO:
* delete interrupt.c etc.
* Count interrupts
* make sure interrupts disabled properly
* should handler check again for more interrupts before exit?
* How to enable interrupts from an interrupt handler?
* Make sure there is an entry for everything in ISR_Vector_Table
*/
/*
* Init the external interrupt scheme
* called by bsp_start()
*/
rtems_status_code
signal_initialize(void)
{
struct sigaction act;
sigset_t mask;
/* mark them all active except for TraceTrap and Abort */
sigfillset(&mask);
sigdelset(&mask, SIGTRAP);
sigdelset(&mask, SIGABRT);
sigdelset(&mask, SIGIOT);
sigdelset(&mask, SIGCONT);
sigprocmask(SIG_UNBLOCK, &mask, 0);
act.sa_handler = interrupt_handler;
act.sa_mask = mask;
#if defined(solaris)
act.sa_flags = SA_RESTART;
#else
act.sa_flags = 0;
#endif
sigaction(SIGHUP, &act, 0);
sigaction(SIGINT, &act, 0);
sigaction(SIGQUIT, &act, 0);
sigaction(SIGILL, &act, 0);
sigaction(SIGEMT, &act, 0);
sigaction(SIGFPE, &act, 0);
sigaction(SIGKILL, &act, 0);
sigaction(SIGBUS, &act, 0);
sigaction(SIGSEGV, &act, 0);
sigaction(SIGSYS, &act, 0);
sigaction(SIGPIPE, &act, 0);
sigaction(SIGALRM, &act, 0);
sigaction(SIGTERM, &act, 0);
sigaction(SIGUSR1, &act, 0);
sigaction(SIGUSR2, &act, 0);
sigaction(SIGCHLD, &act, 0);
sigaction(SIGCLD, &act, 0);
sigaction(SIGPWR, &act, 0);
sigaction(SIGVTALRM, &act, 0);
sigaction(SIGPROF, &act, 0);
sigaction(SIGIO, &act, 0);
sigaction(SIGWINCH, &act, 0);
sigaction(SIGSTOP, &act, 0);
sigaction(SIGTTIN, &act, 0);
sigaction(SIGTTOU, &act, 0);
sigaction(SIGURG, &act, 0);
/*
* XXX: Really should be on HPUX.
*/
#if defined(hppa1_1)
sigaction(SIGLOST, &act, 0);
#endif
return RTEMS_SUCCESSFUL;
}
/*
* External interrupt handler.
* This is installed as cpu interrupt handler.
* It vectors out to specific external interrupt handlers.
*/
void
interrupt_handler(int vector)
{
if (_ISR_Nest_level++ == 0) {
/* switch to interrupt stack */
}
_Thread_Dispatch_disable_level++;
if (_ISR_Vector_table[vector]) {
_ISR_Vector_table[vector](vector);
}
else {
Stray_signal(vector);
}
if (_ISR_Nest_level-- == 0) {
/* switch back to original stack */
}
_Thread_Dispatch_disable_level--;
if (_Thread_Dispatch_disable_level == 0 &&
(_Context_Switch_necessary || _ISR_Signals_to_thread_executing)) {
_CPU_Enable_signal(0);
_Thread_Dispatch();
}
}
void
Stray_signal(int sig_num)
{
char buffer[ 80 ];
/*
* We avoid using the stdio section of the library.
* The following is generally safe.
*/
write(
2,
buffer,
sprintf( buffer, "Stray signal %d\n", sig_num )
);
/*
* If it was a "fatal" signal, then exit here
* If app code has installed a hander for one of these, then
* we won't call Stray_signal, so this is ok.
*/
switch (sig_num)
{
case SIGINT:
case SIGHUP:
case SIGQUIT:
case SIGILL:
case SIGEMT:
case SIGKILL:
case SIGBUS:
case SIGSEGV:
case SIGTERM:
_CPU_Fatal_error(0x100 + sig_num);
}
}
void
_CPU_Fatal_error(unsigned32 error)
{
setitimer(ITIMER_REAL, 0, 0);
_exit(error);
}
int
_CPU_ffs(unsigned32 value)
{
int output;
output = ffs(value);
output = output - 1;
return(output);
}
