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freebsd-dev/sys/ia64/include/smp.h

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This is the first snapshot of the FreeBSD/ia64 kernel. This kernel will not work on any real hardware (or fully work on any simulator). Much more needs to happen before this is actually functional but its nice to see the FreeBSD copyright message appear in the ia64 simulator.
2000-09-29 13:46:07 +00:00
/*
* $FreeBSD$
*/
#ifndef _MACHINE_SMP_H_
#define _MACHINE_SMP_H_
#ifdef _KERNEL
Overhaul of the SMP code. Several portions of the SMP kernel support have been made machine independent and various other adjustments have been made to support Alpha SMP. - It splits the per-process portions of hardclock() and statclock() off into hardclock_process() and statclock_process() respectively. hardclock() and statclock() call the *_process() functions for the current process so that UP systems will run as before. For SMP systems, it is simply necessary to ensure that all other processors execute the *_process() functions when the main clock functions are triggered on one CPU by an interrupt. For the alpha 4100, clock interrupts are delievered in a staggered broadcast fashion, so we simply call hardclock/statclock on the boot CPU and call the *_process() functions on the secondaries. For x86, we call statclock and hardclock as usual and then call forward_hardclock/statclock in the MD code to send an IPI to cause the AP's to execute forwared_hardclock/statclock which then call the *_process() functions. - forward_signal() and forward_roundrobin() have been reworked to be MI and to involve less hackery. Now the cpu doing the forward sets any flags, etc. and sends a very simple IPI_AST to the other cpu(s). AST IPIs now just basically return so that they can execute ast() and don't bother with setting the astpending or needresched flags themselves. This also removes the loop in forward_signal() as sched_lock closes the race condition that the loop worked around. - need_resched(), resched_wanted() and clear_resched() have been changed to take a process to act on rather than assuming curproc so that they can be used to implement forward_roundrobin() as described above. - Various other SMP variables have been moved to a MI subr_smp.c and a new header sys/smp.h declares MI SMP variables and API's. The IPI API's from machine/ipl.h have moved to machine/smp.h which is included by sys/smp.h. - The globaldata_register() and globaldata_find() functions as well as the SLIST of globaldata structures has become MI and moved into subr_smp.c. Also, the globaldata list is only available if SMP support is compiled in. Reviewed by: jake, peter Looked over by: eivind
2001-04-27 19:28:25 +00:00
/*
o Do not parse the MADT as a side-effect in AcpiOsGetRootPointer, do it as a side-effect of probing for MP hardware. This allows us to scan for local SAPICs early (especially before MBUF initialization). o Fix the Local SAPIC structure so that matches the Local SAPIC table entry. Now that the Local SAPIC info is the same as the Local APIC info, stop dumping the Local APIC entries. o For every Local SAPIC entry in the MADT that's not disabled, let the SMP code know about it. They represent actual CPUs. o Register the OS_BOOT_RENDEZ entry point and provide a (bogus) implementation for the entry point. o Provide a mapping for internal IPI numbers to ExtINT vectors. o In a MP system, announce the CPUs and start them by sending IPI_AP_WAKEUP to each of them. Not that it makes a difference at this time :-) o Miscellaneous style fixes and other adjustments.
2001-10-29 02:16:02 +00:00
* Interprocessor interrupts for SMP. The following values are indices
* into the IPI vector table. The SAL gives us the vector used for AP
Cleanup the IPIs.
2001-12-30 09:41:29 +00:00
* wake-up. We base the other vectors on that. Keep IPI_AP_WAKEUP at
o Rename ia64_count_aps to ia64_count_cpus and reimplement the function to return the total number of CPUs and not the highest CPU id. o Define mp_maxid based on the minimum of the actual number of CPUs in the system and MAXCPU. o In cpu_mp_add, when the CPU id of the CPU we're trying to add is larger than mp_maxid, don't add the CPU. Formerly this was based on MAXCPU. Don't count CPUs when we add them. We already know how many CPUs exist. o Replace MAXCPU with mp_maxid when used in loops that iterate over the id space. This avoids a couple of useless iterations. o In cpu_mp_unleash, use the number of CPUs to determine if we need to launch the CPUs. o Remove mp_hardware as it's not used anymore. o Move the IPI vector array from mp_machdep.c to sal.c. We use the array as a centralized place to collect vector assignments. Note that we still assign vectors to SMP specific IPIs in non-SMP configurations. Rename the array from mp_ipi_vector to ipi_vector. o Add IPI_MCA_RENDEZ and IPI_MCA_CMCV. These are used by MCA. Note that IPI_MCA_CMCV is not SMP specific. o Initialize the ipi_vector array so that we place the IPIs in sensible priority classes. The classes are relative to where the AP wake-up vector is located to guarantee that it's the highest priority (external) interrupt. Class assignment is as follows: class IPI notes x AP wake-up (normally x=15) x-1 MCA rendezvous x-2 AST, Rendezvous, stop x-3 CMCV, test
2002-05-12 05:54:21 +00:00
* index 0 and IPI_MCA_RENDEZ at index 1. See sal.c for details.
Overhaul of the SMP code. Several portions of the SMP kernel support have been made machine independent and various other adjustments have been made to support Alpha SMP. - It splits the per-process portions of hardclock() and statclock() off into hardclock_process() and statclock_process() respectively. hardclock() and statclock() call the *_process() functions for the current process so that UP systems will run as before. For SMP systems, it is simply necessary to ensure that all other processors execute the *_process() functions when the main clock functions are triggered on one CPU by an interrupt. For the alpha 4100, clock interrupts are delievered in a staggered broadcast fashion, so we simply call hardclock/statclock on the boot CPU and call the *_process() functions on the secondaries. For x86, we call statclock and hardclock as usual and then call forward_hardclock/statclock in the MD code to send an IPI to cause the AP's to execute forwared_hardclock/statclock which then call the *_process() functions. - forward_signal() and forward_roundrobin() have been reworked to be MI and to involve less hackery. Now the cpu doing the forward sets any flags, etc. and sends a very simple IPI_AST to the other cpu(s). AST IPIs now just basically return so that they can execute ast() and don't bother with setting the astpending or needresched flags themselves. This also removes the loop in forward_signal() as sched_lock closes the race condition that the loop worked around. - need_resched(), resched_wanted() and clear_resched() have been changed to take a process to act on rather than assuming curproc so that they can be used to implement forward_roundrobin() as described above. - Various other SMP variables have been moved to a MI subr_smp.c and a new header sys/smp.h declares MI SMP variables and API's. The IPI API's from machine/ipl.h have moved to machine/smp.h which is included by sys/smp.h. - The globaldata_register() and globaldata_find() functions as well as the SLIST of globaldata structures has become MI and moved into subr_smp.c. Also, the globaldata list is only available if SMP support is compiled in. Reviewed by: jake, peter Looked over by: eivind
2001-04-27 19:28:25 +00:00
*/
o Rename ia64_count_aps to ia64_count_cpus and reimplement the function to return the total number of CPUs and not the highest CPU id. o Define mp_maxid based on the minimum of the actual number of CPUs in the system and MAXCPU. o In cpu_mp_add, when the CPU id of the CPU we're trying to add is larger than mp_maxid, don't add the CPU. Formerly this was based on MAXCPU. Don't count CPUs when we add them. We already know how many CPUs exist. o Replace MAXCPU with mp_maxid when used in loops that iterate over the id space. This avoids a couple of useless iterations. o In cpu_mp_unleash, use the number of CPUs to determine if we need to launch the CPUs. o Remove mp_hardware as it's not used anymore. o Move the IPI vector array from mp_machdep.c to sal.c. We use the array as a centralized place to collect vector assignments. Note that we still assign vectors to SMP specific IPIs in non-SMP configurations. Rename the array from mp_ipi_vector to ipi_vector. o Add IPI_MCA_RENDEZ and IPI_MCA_CMCV. These are used by MCA. Note that IPI_MCA_CMCV is not SMP specific. o Initialize the ipi_vector array so that we place the IPIs in sensible priority classes. The classes are relative to where the AP wake-up vector is located to guarantee that it's the highest priority (external) interrupt. Class assignment is as follows: class IPI notes x AP wake-up (normally x=15) x-1 MCA rendezvous x-2 AST, Rendezvous, stop x-3 CMCV, test
2002-05-12 05:54:21 +00:00
/* Architecture specific IPIs. */
#define IPI_AP_WAKEUP 0
Revamp of the syscall path, exception and context handling. The 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)
2003-05-16 21:26:42 +00:00
#define IPI_HIGH_FP 1
o Rename ia64_count_aps to ia64_count_cpus and reimplement the function to return the total number of CPUs and not the highest CPU id. o Define mp_maxid based on the minimum of the actual number of CPUs in the system and MAXCPU. o In cpu_mp_add, when the CPU id of the CPU we're trying to add is larger than mp_maxid, don't add the CPU. Formerly this was based on MAXCPU. Don't count CPUs when we add them. We already know how many CPUs exist. o Replace MAXCPU with mp_maxid when used in loops that iterate over the id space. This avoids a couple of useless iterations. o In cpu_mp_unleash, use the number of CPUs to determine if we need to launch the CPUs. o Remove mp_hardware as it's not used anymore. o Move the IPI vector array from mp_machdep.c to sal.c. We use the array as a centralized place to collect vector assignments. Note that we still assign vectors to SMP specific IPIs in non-SMP configurations. Rename the array from mp_ipi_vector to ipi_vector. o Add IPI_MCA_RENDEZ and IPI_MCA_CMCV. These are used by MCA. Note that IPI_MCA_CMCV is not SMP specific. o Initialize the ipi_vector array so that we place the IPIs in sensible priority classes. The classes are relative to where the AP wake-up vector is located to guarantee that it's the highest priority (external) interrupt. Class assignment is as follows: class IPI notes x AP wake-up (normally x=15) x-1 MCA rendezvous x-2 AST, Rendezvous, stop x-3 CMCV, test
2002-05-12 05:54:21 +00:00
#define IPI_MCA_CMCV 2
Revamp of the syscall path, exception and context handling. The 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)
2003-05-16 21:26:42 +00:00
#define IPI_MCA_RENDEZ 3
#define IPI_TEST 4
o Rename ia64_count_aps to ia64_count_cpus and reimplement the function to return the total number of CPUs and not the highest CPU id. o Define mp_maxid based on the minimum of the actual number of CPUs in the system and MAXCPU. o In cpu_mp_add, when the CPU id of the CPU we're trying to add is larger than mp_maxid, don't add the CPU. Formerly this was based on MAXCPU. Don't count CPUs when we add them. We already know how many CPUs exist. o Replace MAXCPU with mp_maxid when used in loops that iterate over the id space. This avoids a couple of useless iterations. o In cpu_mp_unleash, use the number of CPUs to determine if we need to launch the CPUs. o Remove mp_hardware as it's not used anymore. o Move the IPI vector array from mp_machdep.c to sal.c. We use the array as a centralized place to collect vector assignments. Note that we still assign vectors to SMP specific IPIs in non-SMP configurations. Rename the array from mp_ipi_vector to ipi_vector. o Add IPI_MCA_RENDEZ and IPI_MCA_CMCV. These are used by MCA. Note that IPI_MCA_CMCV is not SMP specific. o Initialize the ipi_vector array so that we place the IPIs in sensible priority classes. The classes are relative to where the AP wake-up vector is located to guarantee that it's the highest priority (external) interrupt. Class assignment is as follows: class IPI notes x AP wake-up (normally x=15) x-1 MCA rendezvous x-2 AST, Rendezvous, stop x-3 CMCV, test
2002-05-12 05:54:21 +00:00
/* Machine independent IPIs. */
Revamp of the syscall path, exception and context handling. The 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)
2003-05-16 21:26:42 +00:00
#define IPI_AST 5
#define IPI_RENDEZVOUS 6
#define IPI_STOP 7
o Do not parse the MADT as a side-effect in AcpiOsGetRootPointer, do it as a side-effect of probing for MP hardware. This allows us to scan for local SAPICs early (especially before MBUF initialization). o Fix the Local SAPIC structure so that matches the Local SAPIC table entry. Now that the Local SAPIC info is the same as the Local APIC info, stop dumping the Local APIC entries. o For every Local SAPIC entry in the MADT that's not disabled, let the SMP code know about it. They represent actual CPUs. o Register the OS_BOOT_RENDEZ entry point and provide a (bogus) implementation for the entry point. o Provide a mapping for internal IPI numbers to ExtINT vectors. o In a MP system, announce the CPUs and start them by sending IPI_AP_WAKEUP to each of them. Not that it makes a difference at this time :-) o Miscellaneous style fixes and other adjustments.
2001-10-29 02:16:02 +00:00
Revamp of the syscall path, exception and context handling. The 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)
2003-05-16 21:26:42 +00:00
#define IPI_COUNT 8
This is the first snapshot of the FreeBSD/ia64 kernel. This kernel will not work on any real hardware (or fully work on any simulator). Much more needs to happen before this is actually functional but its nice to see the FreeBSD copyright message appear in the ia64 simulator.
2000-09-29 13:46:07 +00:00
#ifndef LOCORE
o Rename ia64_count_aps to ia64_count_cpus and reimplement the function to return the total number of CPUs and not the highest CPU id. o Define mp_maxid based on the minimum of the actual number of CPUs in the system and MAXCPU. o In cpu_mp_add, when the CPU id of the CPU we're trying to add is larger than mp_maxid, don't add the CPU. Formerly this was based on MAXCPU. Don't count CPUs when we add them. We already know how many CPUs exist. o Replace MAXCPU with mp_maxid when used in loops that iterate over the id space. This avoids a couple of useless iterations. o In cpu_mp_unleash, use the number of CPUs to determine if we need to launch the CPUs. o Remove mp_hardware as it's not used anymore. o Move the IPI vector array from mp_machdep.c to sal.c. We use the array as a centralized place to collect vector assignments. Note that we still assign vectors to SMP specific IPIs in non-SMP configurations. Rename the array from mp_ipi_vector to ipi_vector. o Add IPI_MCA_RENDEZ and IPI_MCA_CMCV. These are used by MCA. Note that IPI_MCA_CMCV is not SMP specific. o Initialize the ipi_vector array so that we place the IPIs in sensible priority classes. The classes are relative to where the AP wake-up vector is located to guarantee that it's the highest priority (external) interrupt. Class assignment is as follows: class IPI notes x AP wake-up (normally x=15) x-1 MCA rendezvous x-2 AST, Rendezvous, stop x-3 CMCV, test
2002-05-12 05:54:21 +00:00
extern int ipi_vector[];
This is the first snapshot of the FreeBSD/ia64 kernel. This kernel will not work on any real hardware (or fully work on any simulator). Much more needs to happen before this is actually functional but its nice to see the FreeBSD copyright message appear in the ia64 simulator.
2000-09-29 13:46:07 +00:00
o Do not parse the MADT as a side-effect in AcpiOsGetRootPointer, do it as a side-effect of probing for MP hardware. This allows us to scan for local SAPICs early (especially before MBUF initialization). o Fix the Local SAPIC structure so that matches the Local SAPIC table entry. Now that the Local SAPIC info is the same as the Local APIC info, stop dumping the Local APIC entries. o For every Local SAPIC entry in the MADT that's not disabled, let the SMP code know about it. They represent actual CPUs. o Register the OS_BOOT_RENDEZ entry point and provide a (bogus) implementation for the entry point. o Provide a mapping for internal IPI numbers to ExtINT vectors. o In a MP system, announce the CPUs and start them by sending IPI_AP_WAKEUP to each of them. Not that it makes a difference at this time :-) o Miscellaneous style fixes and other adjustments.
2001-10-29 02:16:02 +00:00
void ipi_all(int ipi);
void ipi_all_but_self(int ipi);
void ipi_selected(u_int64_t cpus, int ipi);
void ipi_self(int ipi);
Revamp of the syscall path, exception and context handling. The 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)
2003-05-16 21:26:42 +00:00
void ipi_send(u_int64_t lid, int ipi);
This is the first snapshot of the FreeBSD/ia64 kernel. This kernel will not work on any real hardware (or fully work on any simulator). Much more needs to happen before this is actually functional but its nice to see the FreeBSD copyright message appear in the ia64 simulator.
2000-09-29 13:46:07 +00:00
#endif /* !LOCORE */
#endif /* _KERNEL */
Overhaul of the SMP code. Several portions of the SMP kernel support have been made machine independent and various other adjustments have been made to support Alpha SMP. - It splits the per-process portions of hardclock() and statclock() off into hardclock_process() and statclock_process() respectively. hardclock() and statclock() call the *_process() functions for the current process so that UP systems will run as before. For SMP systems, it is simply necessary to ensure that all other processors execute the *_process() functions when the main clock functions are triggered on one CPU by an interrupt. For the alpha 4100, clock interrupts are delievered in a staggered broadcast fashion, so we simply call hardclock/statclock on the boot CPU and call the *_process() functions on the secondaries. For x86, we call statclock and hardclock as usual and then call forward_hardclock/statclock in the MD code to send an IPI to cause the AP's to execute forwared_hardclock/statclock which then call the *_process() functions. - forward_signal() and forward_roundrobin() have been reworked to be MI and to involve less hackery. Now the cpu doing the forward sets any flags, etc. and sends a very simple IPI_AST to the other cpu(s). AST IPIs now just basically return so that they can execute ast() and don't bother with setting the astpending or needresched flags themselves. This also removes the loop in forward_signal() as sched_lock closes the race condition that the loop worked around. - need_resched(), resched_wanted() and clear_resched() have been changed to take a process to act on rather than assuming curproc so that they can be used to implement forward_roundrobin() as described above. - Various other SMP variables have been moved to a MI subr_smp.c and a new header sys/smp.h declares MI SMP variables and API's. The IPI API's from machine/ipl.h have moved to machine/smp.h which is included by sys/smp.h. - The globaldata_register() and globaldata_find() functions as well as the SLIST of globaldata structures has become MI and moved into subr_smp.c. Also, the globaldata list is only available if SMP support is compiled in. Reviewed by: jake, peter Looked over by: eivind
2001-04-27 19:28:25 +00:00
#endif /* !_MACHINE_SMP_H */
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