/*
 * This is the SPARC Linux incarnation of arch-dependent OS-dependent
 * routines. See also "linux-os.c".
 */

/*
 * This software is part of the SBCL system. See the README file for
 * more information.
 *
 * This software is derived from the CMU CL system, which was
 * written at Carnegie Mellon University and released into the
 * public domain. The software is in the public domain and is
 * provided with absolutely no warranty. See the COPYING and CREDITS
 * files for more information.
 */

#include <stdio.h>
#include <sys/param.h>
#include <sys/file.h>
#include "genesis/sbcl.h"
#include "os.h"
#include "arch.h"
#include "globals.h"
#include "interrupt.h"
#include "interr.h"
#include "lispregs.h"

#include <sys/types.h>
#include <signal.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <unistd.h>

#include "validate.h"

#ifdef LISP_FEATURE_SB_THREAD
#error "Define threading support functions"
#else
int arch_os_thread_init(struct thread *thread) {
    return 1;                   /* success */
}
int arch_os_thread_cleanup(struct thread *thread) {
    return 1;                   /* success */
}
#endif

os_context_register_t   *
os_context_register_addr(os_context_t *context, int offset)
{
    if (offset == 0) {
        static int zero;
        zero = 0;
        return (os_context_register_t*)&zero;
    } else if (offset < 16) {
        return &context->si_regs.u_regs[offset];
    } else if (offset < 32) {
        unsigned int *sp = (unsigned int*) context->si_regs.u_regs[14]; /* Stack Pointer */
        return &(sp[offset-16]);
    } else
        return 0;
}

os_context_register_t *
os_context_npc_addr(os_context_t *context)
{
    return &(context->si_regs.npc);
}

sigset_t *
os_context_sigmask_addr(os_context_t *context)
{
    return (sigset_t*)&(context->si_mask);
}

os_context_register_t *
os_context_float_register_addr(os_context_t *context, int offset)
{
    ucontext_t *uc = (ucontext_t *)context;
    return (os_context_register_t *)&uc->uc_mcontext.fpregs.fpu_fr.fpu_regs[offset];
}

void
os_restore_fp_control(os_context_t *context)
{
    /* Included here, for reference, is an attempt at the PPC
       variant. If it weren't the case that SPARC/Linux gave a Bus
       Error on floating point exceptions, something like this would
       have to be done. -- CSR, 2002-07-13

    asm ("msfsf $255, %0" : : "m"
         (os_context_fp_control(context) &
          ~ (FLOAT_STICKY_BITS_MASK | FLOAT_EXCEPTIONS_BYTE_MASK)));
    */
}

void
os_flush_icache(os_vm_address_t address, os_vm_size_t length)
{
    /* This is the same for linux and solaris, so see sparc-assem.S */
    extern void sparc_flush_icache(os_vm_address_t,os_vm_size_t);
    sparc_flush_icache(address,length);
}
