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Merged
jserv merged 1 commit into from
May 7, 2026
+16 −0
Merged

Build on pre-Sequoia SDKs #14

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16 changes: 16 additions & 0 deletions src/syscall/syscall.c
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Original file line number Diff line number Diff line change
Expand Up @@ -63,6 +63,22 @@
/* Generated from src/syscall/dispatch.tbl into $(BUILD_DIR). */
#include "dispatch.h"

/* HV_SYS_REG_ACTLR_EL1 was added in the macOS 15 (Sequoia) SDK. Older SDKs
* (e.g., the Nix-pinned apple-sdk-14.4) lack the enumerator. The encoding is
* stable: op0=3, op1=0, CRn=1, CRm=0, op2=1 -> 0xc081. Hypervisor.framework
* exposes ACTLR_EL1 only on hardware/OS combinations where the bit is
* meaningful (Apple Silicon TSO toggle); older platforms simply leave actlr
* at 0, which falls through to PR_SET_MEM_MODEL_DEFAULT.
*
* The guard checks the SDK version rather than the macro presence: on
* macOS 15+ the symbol is an enumerator (not a #define), so a plain
* #ifndef would always fire and shadow the SDK name with a macro of the
* same spelling.
*/
#if __MAC_OS_X_VERSION_MAX_ALLOWED < 150000
#define HV_SYS_REG_ACTLR_EL1 ((hv_sys_reg_t) 0xc081)
#endif


void syscall_init(void)
{
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