4 ;;;; Machine Architecture parameters:
6 (def!constant n-word-bits 32
7 "Number of bits per word where a word holds one lisp descriptor.")
9 ;;; the natural width of a machine word (as seen in e.g. register width,
11 (def!constant n-machine-word-bits 32)
13 (def!constant n-byte-bits 8
14 "Number of bits per byte where a byte is the smallest addressable object.")
16 (def!constant word-shift (1- (integer-length (/ n-word-bits n-byte-bits)))
17 "Number of bits to shift between word addresses and byte addresses.")
19 (def!constant n-word-bytes (/ n-word-bits n-byte-bits)
20 "Number of bytes in a word.")
22 (def!constant float-sign-shift 31)
24 (def!constant single-float-bias 126)
25 (defconstant-eqx single-float-exponent-byte (byte 8 23) #'equal)
26 (defconstant-eqx single-float-significand-byte (byte 23 0) #'equal)
27 (def!constant single-float-normal-exponent-min 1)
28 (def!constant single-float-normal-exponent-max 254)
29 (def!constant single-float-hidden-bit (ash 1 23))
30 (def!constant single-float-trapping-nan-bit (ash 1 22))
32 (def!constant double-float-bias 1022)
33 (defconstant-eqx double-float-exponent-byte (byte 11 20) #'equal)
34 (defconstant-eqx double-float-significand-byte (byte 20 0) #'equal)
35 (def!constant double-float-normal-exponent-min 1)
36 (def!constant double-float-normal-exponent-max #x7FE)
37 (def!constant double-float-hidden-bit (ash 1 20))
38 (def!constant double-float-trapping-nan-bit (ash 1 19))
40 (def!constant single-float-digits
41 (+ (byte-size single-float-significand-byte) 1))
43 (def!constant double-float-digits
44 (+ (byte-size double-float-significand-byte) n-word-bits 1))
46 (def!constant float-inexact-trap-bit (ash 1 0))
47 (def!constant float-underflow-trap-bit (ash 1 1))
48 (def!constant float-overflow-trap-bit (ash 1 2))
49 (def!constant float-divide-by-zero-trap-bit (ash 1 3))
50 (def!constant float-invalid-trap-bit (ash 1 4))
52 (def!constant float-round-to-nearest 0)
53 (def!constant float-round-to-zero 1)
54 (def!constant float-round-to-positive 2)
55 (def!constant float-round-to-negative 3)
57 (defconstant-eqx float-rounding-mode (byte 2 7) #'equal)
58 (defconstant-eqx float-sticky-bits (byte 5 27) #'equal)
59 (defconstant-eqx float-traps-byte (byte 5 0) #'equal)
60 (defconstant-eqx float-exceptions-byte (byte 5 27) #'equal)
61 (def!constant float-condition-bit (ash 1 26))
62 (def!constant float-fast-bit 0) ; No fast mode on HPPA.
66 ;;;; Description of the target address space.
68 ;;; Where to put the different spaces.
70 (def!constant read-only-space-start #x20000000)
71 (def!constant read-only-space-end #x24000000)
73 (def!constant static-space-start #x28000000)
74 (def!constant static-space-end #x2a000000)
76 (def!constant dynamic-space-start #x30000000)
77 (def!constant dynamic-space-end #x37fff000)
79 (def!constant dynamic-0-space-start #x30000000)
80 (def!constant dynamic-0-space-end #x37fff000)
81 (def!constant dynamic-1-space-start #x38000000)
82 (def!constant dynamic-1-space-end #x3ffff000)
84 ;;; FIXME: WTF are these for?
86 ;; The space-register holding the lisp heap.
87 (def!constant lisp-heap-space 5)
89 ;; The space-register holding the C text segment.
90 (def!constant c-text-space 4)
93 ;;;; Other random constants.
95 (defenum (:suffix -trap :start 8)
102 single-step-breakpoint)
104 (defenum (:prefix trace-table-)
114 ;;; These symbols are loaded into static space directly after NIL so
115 ;;; that the system can compute their address by adding a constant
118 ;;; The fdefn objects for the static functions are loaded into static
119 ;;; space directly after the static symbols. That way, the raw-addr
120 ;;; can be loaded directly out of them by indirecting relative to NIL.
122 (defparameter *static-symbols*
125 ;; The C startup code must fill these in.
128 ;; Functions that the C code needs to call
130 sb!kernel::internal-error
131 sb!kernel::control-stack-exhausted-error
132 sb!di::handle-breakpoint
133 sb!impl::fdefinition-object
136 *read-only-space-free-pointer*
137 *static-space-free-pointer*
138 *initial-dynamic-space-free-pointer*
140 ;; Things needed for non-local-exit.
141 *current-catch-block*
142 *current-unwind-protect-block*
144 *binding-stack-start*
145 *control-stack-start*
148 ;; Interrupt Handling
149 *free-interrupt-context-index*
150 sb!unix::*interrupts-enabled*
151 sb!unix::*interrupt-pending*
154 (defparameter *static-funs*
165 sb!kernel:two-arg-and
166 sb!kernel:two-arg-ior
167 sb!kernel:two-arg-xor
168 sb!kernel:two-arg-gcd
169 sb!kernel:two-arg-lcm