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
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=360552
@ -55,6 +55,7 @@
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#define SBI_ERR_INVALID_PARAM -3
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#define SBI_ERR_DENIED -4
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#define SBI_ERR_INVALID_ADDRESS -5
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#define SBI_ERR_ALREADY_AVAILABLE -6
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/* SBI Base Extension */
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#define SBI_EXT_ID_BASE 0x10
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@ -66,6 +67,16 @@
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#define SBI_BASE_GET_MARCHID 5
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#define SBI_BASE_GET_MIMPID 6
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/* Hart State Management (HSM) Extension */
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#define SBI_EXT_ID_HSM 0x48534D
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#define SBI_HSM_HART_START 0
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#define SBI_HSM_HART_STOP 1
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#define SBI_HSM_HART_STATUS 2
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#define SBI_HSM_STATUS_STARTED 0
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#define SBI_HSM_STATUS_STOPPED 1
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#define SBI_HSM_STATUS_START_PENDING 2
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#define SBI_HSM_STATUS_STOP_PENDING 3
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/* Legacy Extensions */
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#define SBI_SET_TIMER 0
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#define SBI_CONSOLE_PUTCHAR 1
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@ -128,6 +139,30 @@ sbi_probe_extension(long id)
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return (SBI_CALL1(SBI_EXT_ID_BASE, SBI_BASE_PROBE_EXTENSION, id).value);
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}
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/* Hart State Management extension functions. */
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/*
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* Start execution on the specified hart at physical address start_addr. The
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* register a0 will contain the hart's ID, and a1 will contain the value of
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* priv.
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*/
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int sbi_hsm_hart_start(u_long hart, u_long start_addr, u_long priv);
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/*
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* Stop execution on the current hart. Interrupts should be disabled, or this
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* function may return.
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*/
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void sbi_hsm_hart_stop(void);
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/*
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* Get the execution status of the specified hart. The status will be one of:
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* - SBI_HSM_STATUS_STARTED
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* - SBI_HSM_STATUS_STOPPED
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* - SBI_HSM_STATUS_START_PENDING
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* - SBI_HSM_STATUS_STOP_PENDING
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*/
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int sbi_hsm_hart_status(u_long hart);
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/* Legacy extension functions. */
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static __inline void
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sbi_console_putchar(int ch)
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@ -113,6 +113,31 @@ sbi_print_version(void)
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printf("SBI Specification Version: %u.%u\n", major, minor);
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}
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int
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sbi_hsm_hart_start(u_long hart, u_long start_addr, u_long priv)
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{
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struct sbi_ret ret;
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ret = SBI_CALL3(SBI_EXT_ID_HSM, SBI_HSM_HART_START, hart, start_addr, priv);
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return (ret.error != 0 ? (int)ret.error : 0);
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}
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void
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sbi_hsm_hart_stop(void)
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{
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(void)SBI_CALL0(SBI_EXT_ID_HSM, SBI_HSM_HART_STOP);
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}
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int
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sbi_hsm_hart_status(u_long hart)
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{
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struct sbi_ret ret;
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ret = SBI_CALL1(SBI_EXT_ID_HSM, SBI_HSM_HART_STATUS, hart);
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return (ret.error != 0 ? (int)ret.error : (int)ret.value);
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}
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void
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sbi_init(void)
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{
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