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lib: Provide a platform hook to implement vendor specific SBI extensions.
SBI v0.2 specification allows vendor extensions and it should be implemented in a independent of the core sbi library. Introduce a single platform callback that will let platforms handle all vendor extensions in platform specific code if they want. Signed-off-by: Atish Patra <atish.patra@wdc.com> Reviewed-by: Anup Patel <anup.patel@wdc.com>
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0790be0f2c
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30f09fbfd1
3 changed files with 86 additions and 3 deletions
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@ -38,6 +38,8 @@ enum sbi_ext_base_fid {
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#define SBI_SPEC_VERSION_MAJOR_OFFSET 24
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#define SBI_SPEC_VERSION_MAJOR_MASK 0x7f
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#define SBI_SPEC_VERSION_MINOR_MASK 0xffffff
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#define SBI_EXT_VENDOR_START 0x09000000
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#define SBI_EXT_VENDOR_END 0x09FFFFFF
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/* clang-format on */
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#endif
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@ -43,6 +43,8 @@
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#include <sbi/sbi_version.h>
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#include <sbi/sbi_scratch.h>
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#include <sbi/sbi_ecall.h>
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#include <sbi/sbi_error.h>
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/** Possible feature flags of a platform */
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enum sbi_platform_features {
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@ -112,6 +114,14 @@ struct sbi_platform_operations {
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int (*system_reboot)(u32 type);
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/** Shutdown or poweroff the platform */
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int (*system_shutdown)(u32 type);
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/** platform specific SBI extension implementation probe function */
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int (*vendor_ext_check)(long extid);
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/** platform specific SBI extension implementation provider */
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int (*vendor_ext_provider)(long extid, long funcid,
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unsigned long *args, unsigned long *out_value,
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unsigned long *out_trap_cause,
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unsigned long *out_trap_val);
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} __packed;
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/** Representation of a platform */
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@ -506,6 +516,54 @@ static inline int sbi_platform_system_shutdown(const struct sbi_platform *plat,
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return 0;
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}
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/**
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* Check if a vendor extension is implemented or not.
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*
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* @param plat pointer to struct sbi_platform
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* @param extid vendor SBI extension id
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*
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* @return 0 if extid is not implemented and 1 if implemented
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*/
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static inline int sbi_platform_vendor_ext_check(const struct sbi_platform *plat,
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long extid)
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{
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if (plat && sbi_platform_ops(plat)->vendor_ext_check)
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return sbi_platform_ops(plat)->vendor_ext_check(extid);
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return 0;
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}
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/**
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* Invoke platform specific vendor SBI extension implementation.
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*
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* @param plat pointer to struct sbi_platform
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* @param extid vendor SBI extension id
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* @param funcid SBI function id within the extension id
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* @param args pointer to arguments passed by the caller
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* @param out_value output value that can be filled the callee
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* @param out_tcause trap cause that can be filled the callee
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* @param out_tvalue possible trap value that can be filled the callee
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*
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* @return 0 on success and negative error code on failure
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*/
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static inline int sbi_platform_vendor_ext_provider(const struct sbi_platform *plat,
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long extid, long funcid,
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unsigned long *args,
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unsigned long *out_value,
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unsigned long *out_tcause,
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unsigned long *out_tval)
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{
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if (plat && sbi_platform_ops(plat)->vendor_ext_provider) {
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return sbi_platform_ops(plat)->vendor_ext_provider(extid,
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funcid, args,
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out_value,
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out_tcause,
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out_tval);
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}
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return SBI_ENOTSUPP;
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}
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#endif
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#endif
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@ -12,6 +12,7 @@
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#include <sbi/sbi_ecall_interface.h>
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#include <sbi/sbi_error.h>
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#include <sbi/sbi_ipi.h>
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#include <sbi/sbi_platform.h>
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#include <sbi/sbi_system.h>
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#include <sbi/sbi_timer.h>
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#include <sbi/sbi_tlb.h>
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@ -47,14 +48,30 @@ int sbi_check_extension(struct sbi_scratch *scratch, unsigned long extid,
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*/
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if ((extid >= SBI_EXT_0_1_SET_TIMER &&
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extid <= SBI_EXT_0_1_SHUTDOWN) || (extid == SBI_EXT_BASE))
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extid <= SBI_EXT_0_1_SHUTDOWN) || (extid == SBI_EXT_BASE)) {
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*out_val = 1;
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else
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} else if (extid >= SBI_EXT_VENDOR_START &&
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extid <= SBI_EXT_VENDOR_END) {
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*out_val = sbi_platform_vendor_ext_check(
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sbi_platform_ptr(scratch),
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extid);
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} else
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*out_val = 0;
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return 0;
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}
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int sbi_ecall_vendor_ext_handler(struct sbi_scratch *scratch,
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unsigned long extid, unsigned long funcid,
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unsigned long *args, unsigned long *out_val,
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unsigned long *out_tcause,
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unsigned long *out_tval)
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{
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return sbi_platform_vendor_ext_provider(sbi_platform_ptr(scratch),
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extid, funcid, args, out_val,
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out_tcause, out_tval);
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}
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int sbi_ecall_base_handler(struct sbi_scratch *scratch, unsigned long extid,
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unsigned long funcid, unsigned long *args,
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unsigned long *out_val, unsigned long *out_tcause,
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@ -195,8 +212,14 @@ int sbi_ecall_handler(u32 hartid, ulong mcause, struct sbi_trap_regs *regs,
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ret = sbi_ecall_base_handler(scratch, extension_id, func_id,
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args, &out_val,
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&out_tval, &out_tcause);
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else
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else if (extension_id >= SBI_EXT_VENDOR_START &&
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extension_id <= SBI_EXT_VENDOR_END) {
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ret = sbi_ecall_vendor_ext_handler(scratch, extension_id,
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func_id, args, &out_val,
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&out_tval, &out_tcause);
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} else {
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ret = SBI_ENOTSUPP;
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}
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if (ret == SBI_ETRAP) {
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sbi_trap_redirect(regs, scratch, regs->mepc,
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