diff options
Diffstat (limited to 'nuttx/arch/x86/include/i486/irq.h')
| -rwxr-xr-x | nuttx/arch/x86/include/i486/irq.h | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/nuttx/arch/x86/include/i486/irq.h b/nuttx/arch/x86/include/i486/irq.h index c82c92859..cb78e4d81 100755 --- a/nuttx/arch/x86/include/i486/irq.h +++ b/nuttx/arch/x86/include/i486/irq.h @@ -62,19 +62,25 @@ #define REG_EDI (1) /* Saved by pusha */ #define REG_ESI (2) /* " " "" " " */ #define REG_EBP (3) /* " " "" " " */ -#define REG_ESP (4) /* " " "" " " */ +#define REG_ESP (4) /* " " "" " " (NOTE 1)*/ #define REG_EBX (5) /* " " "" " " */ #define REG_EDX (6) /* " " "" " " */ #define REG_ECX (7) /* " " "" " " */ #define REG_EAX (8) /* " " "" " " */ -#define REG_IRQNO (9) /* Interrupt number */ -#define REG_ERRCODE (10) /* Error code */ +#define REG_IRQNO (9) /* Interrupt number (NOTE 2) */ +#define REG_ERRCODE (10) /* Error code (NOTE 2) */ #define REG_EIP (11) /* Pushed by process on interrupt processing */ #define REG_CS (12) /* " " "" " " "" " " " " */ #define REG_EFLAGS (13) /* " " "" " " "" " " " " */ #define REG_SP (14) /* " " "" " " "" " " " " */ #define REG_SS (15) /* " " "" " " "" " " " " */ +/* NOTE 1: Two versions of the ESP are saved: One from the interrupt + * processing and one from pusha. Only the interrupt ESP (REG_SP) is used. + * NOTE 2: This is not really state data. Rather, this is just a convenient + * way to pass parameters from the interrupt handler to C cod. + */ + #define XCPTCONTEXT_REGS (16) #define XCPTCONTEXT_SIZE (4 * XCPTCONTEXT_REGS) |