Firmware/opensbi
8
0
Fork 0
forked from Mirrors/opensbi
Code Pull Requests Activity

lib: sbi: Introduce trap context

Browse Source 
Club the struct sbi_trap_regs and struct sbi_trap_info a new
struct sbi_trap_context (aka trap context) which must be saved
by low-level trap handler before calling sbi_trap_handler().

To track nested traps, the struct sbi_scratch points to the current
trap context and the trap context has pointer to pervious context
of previous trap.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Samuel Holland <samuel.holland@sifive.com>
Tested-by: Samuel Holland <samuel.holland@sifive.com>
This commit is contained in:
Anup Patel
2024-03-11 14:40:12 +05:30
committed by Anup Patel
parent 60ffc154c8
commit abea949721
3 changed files with 103 additions and 46 deletions
Download Patch File Download Diff File Expand all files Collapse all files

29
include/sbi/sbi_trap.h
View File

@@ -112,9 +112,15 @@
/** Size (in bytes) of sbi_trap_info */
#define SBI_TRAP_INFO_SIZE SBI_TRAP_INFO_OFFSET(last)
/** Size (in bytes) of sbi_trap_context */
#define SBI_TRAP_CONTEXT_SIZE (SBI_TRAP_REGS_SIZE + \
SBI_TRAP_INFO_SIZE + \
__SIZEOF_POINTER__)
#ifndef __ASSEMBLER__
#include <sbi/sbi_types.h>
#include <sbi/sbi_scratch.h>
/** Representation of register state at time of trap/interrupt */
struct sbi_trap_regs {
@@ -204,6 +210,16 @@ struct sbi_trap_info {
unsigned long gva;
};
/** Representation of trap context saved on stack */
struct sbi_trap_context {
/** Register state */
struct sbi_trap_regs regs;
/** Trap details */
struct sbi_trap_info trap;
/** Pointer to previous trap context */
struct sbi_trap_context *prev_context;
};
static inline unsigned long sbi_regs_gva(const struct sbi_trap_regs *regs)
{
/*
@@ -223,7 +239,18 @@ static inline unsigned long sbi_regs_gva(const struct sbi_trap_regs *regs)
int sbi_trap_redirect(struct sbi_trap_regs *regs,
const struct sbi_trap_info *trap);
struct sbi_trap_regs *sbi_trap_handler(struct sbi_trap_regs *regs);
static inline struct sbi_trap_context *sbi_trap_get_context(struct sbi_scratch *scratch)
{
return (scratch) ? (void *)scratch->trap_context : NULL;
}
static inline void sbi_trap_set_context(struct sbi_scratch *scratch,
struct sbi_trap_context *tcntx)
{
scratch->trap_context = (unsigned long)tcntx;
}
struct sbi_trap_context *sbi_trap_handler(struct sbi_trap_context *tcntx);
#endif