Author: mhorne Date: Fri May 1 21:55:51 2020 New Revision: 360552 URL: https://svnweb.freebsd.org/changeset/base/360552
Log: Add support for HSM SBI extension The Hardware State Management (HSM) extension provides a set of SBI calls that allow the supervisor software to start and stop hart execution. The HSM extension has been implemented in OpenSBI and is present in the v0.7 release. [1] https://github.com/riscv/riscv-sbi-doc/blob/master/riscv-sbi.adoc Reviewed by: br Differential Revision: https://reviews.freebsd.org/D24496 Modified: head/sys/riscv/include/sbi.h head/sys/riscv/riscv/sbi.c Modified: head/sys/riscv/include/sbi.h ============================================================================== --- head/sys/riscv/include/sbi.h Fri May 1 21:52:29 2020 (r360551) +++ head/sys/riscv/include/sbi.h Fri May 1 21:55:51 2020 (r360552) @@ -55,6 +55,7 @@ #define SBI_ERR_INVALID_PARAM -3 #define SBI_ERR_DENIED -4 #define SBI_ERR_INVALID_ADDRESS -5 +#define SBI_ERR_ALREADY_AVAILABLE -6 /* SBI Base Extension */ #define SBI_EXT_ID_BASE 0x10 @@ -66,6 +67,16 @@ #define SBI_BASE_GET_MARCHID 5 #define SBI_BASE_GET_MIMPID 6 +/* Hart State Management (HSM) Extension */ +#define SBI_EXT_ID_HSM 0x48534D +#define SBI_HSM_HART_START 0 +#define SBI_HSM_HART_STOP 1 +#define SBI_HSM_HART_STATUS 2 +#define SBI_HSM_STATUS_STARTED 0 +#define SBI_HSM_STATUS_STOPPED 1 +#define SBI_HSM_STATUS_START_PENDING 2 +#define SBI_HSM_STATUS_STOP_PENDING 3 + /* Legacy Extensions */ #define SBI_SET_TIMER 0 #define SBI_CONSOLE_PUTCHAR 1 @@ -127,6 +138,30 @@ sbi_probe_extension(long id) { return (SBI_CALL1(SBI_EXT_ID_BASE, SBI_BASE_PROBE_EXTENSION, id).value); } + +/* Hart State Management extension functions. */ + +/* + * Start execution on the specified hart at physical address start_addr. The + * register a0 will contain the hart's ID, and a1 will contain the value of + * priv. + */ +int sbi_hsm_hart_start(u_long hart, u_long start_addr, u_long priv); + +/* + * Stop execution on the current hart. Interrupts should be disabled, or this + * function may return. + */ +void sbi_hsm_hart_stop(void); + +/* + * Get the execution status of the specified hart. The status will be one of: + * - SBI_HSM_STATUS_STARTED + * - SBI_HSM_STATUS_STOPPED + * - SBI_HSM_STATUS_START_PENDING + * - SBI_HSM_STATUS_STOP_PENDING + */ +int sbi_hsm_hart_status(u_long hart); /* Legacy extension functions. */ static __inline void Modified: head/sys/riscv/riscv/sbi.c ============================================================================== --- head/sys/riscv/riscv/sbi.c Fri May 1 21:52:29 2020 (r360551) +++ head/sys/riscv/riscv/sbi.c Fri May 1 21:55:51 2020 (r360552) @@ -113,6 +113,31 @@ sbi_print_version(void) printf("SBI Specification Version: %u.%u\n", major, minor); } +int +sbi_hsm_hart_start(u_long hart, u_long start_addr, u_long priv) +{ + struct sbi_ret ret; + + ret = SBI_CALL3(SBI_EXT_ID_HSM, SBI_HSM_HART_START, hart, start_addr, priv); + return (ret.error != 0 ? (int)ret.error : 0); +} + +void +sbi_hsm_hart_stop(void) +{ + (void)SBI_CALL0(SBI_EXT_ID_HSM, SBI_HSM_HART_STOP); +} + +int +sbi_hsm_hart_status(u_long hart) +{ + struct sbi_ret ret; + + ret = SBI_CALL1(SBI_EXT_ID_HSM, SBI_HSM_HART_STATUS, hart); + + return (ret.error != 0 ? (int)ret.error : (int)ret.value); +} + void sbi_init(void) { _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
