f2c49dd248
prime objectives are: o Implement a syscall path based on the epc inststruction (see sys/ia64/ia64/syscall.s). o Revisit the places were we need to save and restore registers and define those contexts in terms of the register sets (see sys/ia64/include/_regset.h). Secundairy objectives: o Remove the requirement to use contigmalloc for kernel stacks. o Better handling of the high FP registers for SMP systems. o Switch to the new cpu_switch() and cpu_throw() semantics. o Add a good unwinder to reconstruct contexts for the rare cases we need to (see sys/contrib/ia64/libuwx) Many files are affected by this change. Functionally it boils down to: o The EPC syscall doesn't preserve registers it does not need to preserve and places the arguments differently on the stack. This affects libc and truss. o The address of the kernel page directory (kptdir) had to be unstaticized for use by the nested TLB fault handler. The name has been changed to ia64_kptdir to avoid conflicts. The renaming affects libkvm. o The trapframe only contains the special registers and the scratch registers. For syscalls using the EPC syscall path no scratch registers are saved. This affects all places where the trapframe is accessed. Most notably the unaligned access handler, the signal delivery code and the debugger. o Context switching only partly saves the special registers and the preserved registers. This affects cpu_switch() and triggered the move to the new semantics, which additionally affects cpu_throw(). o The high FP registers are either in the PCB or on some CPU. context switching for them is done lazily. This affects trap(). o The mcontext has room for all registers, but not all of them have to be defined in all cases. This mostly affects signal delivery code now. The *context syscalls are as of yet still unimplemented. Many details went into the removal of the requirement to use contigmalloc for kernel stacks. The details are mostly CPU specific and limited to exception_save() and exception_restore(). The few places where we create, destroy or switch stacks were mostly simplified by not having to construct physical addresses and additionally saving the virtual addresses for later use. Besides more efficient context saving and restoring, which of course yields a noticable speedup, this also fixes the dreaded SMP bootup problem as a side-effect. The details of which are still not fully understood. This change includes all the necessary backward compatibility code to have it handle older userland binaries that use the break instruction for syscalls. Support for break-based syscalls has been pessimized in favor of a clean implementation. Due to the overall better performance of the kernel, this will still be notived as an improvement if it's noticed at all. Approved by: re@ (jhb)
41 lines
916 B
C
41 lines
916 B
C
/*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_SMP_H_
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#define _MACHINE_SMP_H_
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#ifdef _KERNEL
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/*
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* Interprocessor interrupts for SMP. The following values are indices
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* into the IPI vector table. The SAL gives us the vector used for AP
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* wake-up. We base the other vectors on that. Keep IPI_AP_WAKEUP at
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* index 0 and IPI_MCA_RENDEZ at index 1. See sal.c for details.
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*/
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/* Architecture specific IPIs. */
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#define IPI_AP_WAKEUP 0
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#define IPI_HIGH_FP 1
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#define IPI_MCA_CMCV 2
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#define IPI_MCA_RENDEZ 3
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#define IPI_TEST 4
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/* Machine independent IPIs. */
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#define IPI_AST 5
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#define IPI_RENDEZVOUS 6
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#define IPI_STOP 7
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#define IPI_COUNT 8
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#ifndef LOCORE
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extern int ipi_vector[];
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void ipi_all(int ipi);
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void ipi_all_but_self(int ipi);
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void ipi_selected(u_int64_t cpus, int ipi);
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void ipi_self(int ipi);
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void ipi_send(u_int64_t lid, int ipi);
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#endif /* !LOCORE */
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#endif /* _KERNEL */
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#endif /* !_MACHINE_SMP_H */
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