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[pxe] Profile all PXE API calls 

Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/19/head
Michael Brown 2014-05-03 00:52:43 +01:00
parent be7f35d9c0
commit 579337c368
1 changed files with 49 additions and 0 deletions
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49
src/arch/i386/interface/pxe/pxe_call.c
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@ -21,6 +21,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
#include <ipxe/uaccess.h>
#include <ipxe/init.h>
#include <ipxe/profile.h>
#include <setjmp.h>
#include <registers.h>
#include <biosint.h>
@ -48,6 +49,26 @@ extern void pxe_int_1a ( void );
/** INT 1A hooked flag */
static int int_1a_hooked = 0;
/** PXENV_UNDI_TRANSMIT API call profiler */
static struct profiler pxe_api_tx_profiler __profiler =
{ .name = "pxeapi.tx" };
/** PXENV_UNDI_ISR API call profiler */
static struct profiler pxe_api_isr_profiler __profiler =
{ .name = "pxeapi.isr" };
/** PXE unknown API call profiler
*
* This profiler can be used to measure the overhead of a dummy PXE
* API call.
*/
static struct profiler pxe_api_unknown_profiler __profiler =
{ .name = "pxeapi.unknown" };
/** Miscellaneous PXE API call profiler */
static struct profiler pxe_api_misc_profiler __profiler =
{ .name = "pxeapi.misc" };
/**
* Handle an unknown PXE API call
*
@ -80,6 +101,27 @@ static struct pxe_api_call * find_pxe_api_call ( uint16_t opcode ) {
return NULL;
}
/**
* Determine applicable profiler (for debugging)
*
* @v opcode PXE opcode
* @ret profiler Profiler
*/
static struct profiler * pxe_api_profiler ( unsigned int opcode ) {
/* Determine applicable profiler */
switch ( opcode ) {
case PXENV_UNDI_TRANSMIT:
return &pxe_api_tx_profiler;
case PXENV_UNDI_ISR:
return &pxe_api_isr_profiler;
case PXENV_UNKNOWN:
return &pxe_api_unknown_profiler;
default:
return &pxe_api_misc_profiler;
}
}
/**
* Dispatch PXE API call
*
@ -90,10 +132,14 @@ static struct pxe_api_call * find_pxe_api_call ( uint16_t opcode ) {
__asmcall void pxe_api_call ( struct i386_all_regs *ix86 ) {
uint16_t opcode = ix86->regs.bx;
userptr_t uparams = real_to_user ( ix86->segs.es, ix86->regs.di );
struct profiler *profiler = pxe_api_profiler ( opcode );
struct pxe_api_call *call;
union u_PXENV_ANY params;
PXENV_EXIT_t ret;
/* Start profiling */
profile_start ( profiler );
/* Locate API call */
call = find_pxe_api_call ( opcode );
if ( ! call ) {
@ -113,6 +159,9 @@ __asmcall void pxe_api_call ( struct i386_all_regs *ix86 ) {
/* Copy modified parameter block back to caller and return */
copy_to_user ( uparams, 0, &params, call->params_len );
ix86->regs.ax = ret;
/* Stop profiling, if applicable */
profile_stop ( profiler );
}
/**