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#include <arch/cpu.h>
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#include <arch/cpu.h>
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#include <arch/pm.h>
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#include <arch/pm.h>
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#include <arch/asm.h>
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#include <arch/asm.h>
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#include <print.h>
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#include <print.h>
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#include <arch/cpu.h>
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extern void syscall_entry(void);
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extern void syscall_entry(void);
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/** Enable & setup support for SYSCALL/SYSRET */
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/** Enable & setup support for SYSCALL/SYSRET */
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void syscall_setup_cpu(void)
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void syscall_setup_cpu(void)
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    write_msr(AMD_MSR_STAR,
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    write_msr(AMD_MSR_STAR,
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          ((__u64)(gdtselector(KDATA_DES) | PL_USER)<<48) \
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          ((__u64)(gdtselector(KDATA_DES) | PL_USER)<<48) \
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          | ((__u64)(gdtselector(KTEXT_DES) | PL_KERNEL)<<32));
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          | ((__u64)(gdtselector(KTEXT_DES) | PL_KERNEL)<<32));
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    write_msr(AMD_MSR_LSTAR, (__u64)syscall_entry);
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    write_msr(AMD_MSR_LSTAR, (__u64)syscall_entry);
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    /* Mask RFLAGS on syscall
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    /* Mask RFLAGS on syscall
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     * - we do not care what is in the flags field
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     * - disable interrupts, until we exchange the stack register
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     *   (mask the IE bit)
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     */
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     */
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    write_msr(AMD_MSR_SFMASK, 0);
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    write_msr(AMD_MSR_SFMASK, 0x200);
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}
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}
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/** Dispatch system call */
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/** Dispatch system call */
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__native syscall_handler(__native id, __native a1, __native a2, __native a3)
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__native syscall_handler(__native id, __native a1, __native a2, __native a3)
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{
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{
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    interrupts_enable();
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    if (id < SYSCALL_END)
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    if (id < SYSCALL_END)
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        return syscall_table[id](a1,a2,a3);
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        return syscall_table[id](a1,a2,a3);
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    else
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    else
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        panic("Undefined syscall %d", id);
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        panic("Undefined syscall %d", id);
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    interrupts_disable();
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}
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}